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Effect of exclusive breastfeeding on selected adverse health and nutritional outcomes: a nationally representative study

BMC Public Health volume 17, Article number: 889 (2017) Cite this article

Abstract

Background

Despite growing evidence in support of exclusive breastfeeding (EBF) among infants in the first 6 months of birth, the debate over the optimal duration of EBF continues. This study examines the effect of termination of EBF during the first 2, 4 and 6 months of birth on a set of adverse health and nutritional outcomes of infants.

Methods

Three waves of Bangladesh Demographic and Health Survey data were analysed using multivariate regression. The adverse health outcomes were: an episode of diarrhea, fever or acute respiratory infection (ARI) during the 2 weeks prior to the survey. Nutritional outcomes were assessed by stunting (height-for-age), wasting (weight-for-height) and underweight (weight-for-age). Population attributable fraction was calculated to estimate percentages of these six outcomes that could have been prevented by supplying EBF.

Results

Fifty-six percent of infants were exclusively breastfed during the first 6 months. Lack of EBF increased the odds of diarrhea, fever and ARI. Among the babies aged 6 months or less 27.37% of diarrhea, 13.24% of fever and 8.94% of ARI could have been prevented if EBF was not discontinued. If EBF was terminated during 0–2 months, 2–4 months the odds of becoming underweight were 2.16 and 2.01 times higher, respectively, than babies for whom EBF was not terminated.

Conclusion

Children who are not offered EBF up to 6 months of their birth may suffer from a range of infectious diseases and under-nutrition. Health promotion and other public health interventions should be enhanced to encourage EBF at least up to six-month of birth.

Trail registration

Data of this study were collected following the guidelines of ICF International and Bangladesh Medical Research Council. The registration number of data collection is 132,989.0.000 and the data-request was registered on September 11, 2016.

Peer Review reports

Background

There is an increasing evidence that exclusive breastfeeding (EBF) up to six-month of age has profound biological effects and important consequences on health and nutritional outcomes of children [1, 2]. The immunological properties of breast milk contribute to ensuring adequate nutritional status, proper growth and develop morbidity prevention capacity in child body [3, 4]. In addition, EBF substantially reduces the risk of morbidity and mortality from infectious diseases by eliminating the chance of contamination from formula milk or other fluids and foods [3].

Although it is now well accepted that EBF is enormously important to infants’ health and nutritional status, the most appropriate age for introducing other food is still debated. Before 2001, the World Health Organization (WHO) recommended introducing solid food at 4–6 months. In 2001 the recommendation was changed to 6 months [5]. This change was, in fact, driven by new evidence about benefits of longer-term EBF against infectious diseases and adequacy of breast milk to meet infants’ nutritional requirements of beyond 4 months of age [6]. However, sometimes the evidence has been questioned [7], and some experts have promoted a less stringent recommendation that is more akin to the pre-2001 WHO policy [8, 9]. Part of this controversy is caused by findings of some individual studies [10]. The debate over the optimal duration of EBF is centered mainly on the choice between the known protective effect of EBF against infectious diseases and the insufficiency of breast milk alone to satisfy babies’ nutritional requirements (known as weanling’s dilemma).

Using nationally representative Bangladesh Demographic and Health Survey (BDHS) data, we examined the effect of termination of EBF during the first 2, 4 and 6 months of birth on a set of adverse health and nutritional outcomes of infants. We also examined the population attributable fraction (PAF) to estimate the percentages of specific health and nutritional outcomes that could have been prevented if EBF was not discontinued during the first 6 months of birth.

Methods

Data sources

From three waves of BDHS conducted in 2007, 2010 and 2014 we pooled data of 1918 babies less than 6 months of age. Details of the survey questionnaire and data collection procedure were published elsewhere [11,12,13,14]. Briefly, the BDHS used two-stage stratified cluster sampling approach. In the first stage, enumeration areas were selected with probability proportional to their size. In the second stage, a systematic sample of 30 households on average was selected from each sampling unit to provide statistically reliable estimates of key demographic and health variables for the country as a whole, for urban and rural areas separately, and for each of the seven divisions of Bangladesh. Two different survey instruments were used for each round of survey: household schedule and individual questionnaire for ever-married women of reproductive age (15–49 years old). Information regarding socio-demographic status of households and members were collected by household schedule. The individual questionnaire was used to collect information on women’s reproductive history, their health and nutritional status, antenatal care, delivery and postnatal care, breastfeeding and infant feeding practices, immunization, child health and nutrition. Overall, rural population constituted 67% (1292/1918) and urban population constituted 33% (626/1918) of the sample. In the combined dataset (n = 1918) the contribution of three waves of survey were 27%, 41% and 32%, respectively.

Outcome variables

A set of adverse health and nutritional outcomes among children were the outcome variables. The adverse health outcomes were an episode of diarrhea, fever or ARI during the 2 weeks prior to the survey. The nutritional outcomes were assessed by stunting (height-for-age), wasting (weight-for-height) and underweight (weight-for-age) classified by WHO growth standard. Adverse health outcomes were ascertained from responses to the following questions: (a) has the baby had any diarrhea in the last 2 weeks? (b) has the baby been ill with a fever at any time during the last 2 weeks? (c) did the baby breathe faster than usual with short, rapid breaths or have difficulty breathing when the baby had an illness with a cough? and (d) was the fast or difficult breathing due to a problem in the chest or to a blocked or runny nose? Responses were recorded “Yes” vs “No”. A child was considered as having experienced ARI if child’s mother reported that during the last 2 weeks preceding the survey the child had a cough along with short, rapid breathing accompanied by a fever. Three different anthropometric measurements (weight, height, age) were taken during the survey to derive the nutritional outcomes.

Exposure variable

Status of EBF from birth to 6 months of age was the key exposure variable. During the survey, respondents were asked (i) whether the baby was still being breastfed; (ii) the duration of breastfeeding; and (iii) if other foods were given during the last 24 h. Finally, to examine the effect of the duration of EBF, we categorized the sample in three subgroups based on EBF cessation time (0–2 months, 2–4 months, and 4–6 months).

Statistical analysis

We used mean and its 95% confidence interval (95% CI) to describe selected demographic information, health and nutritional outcomes of babies and their mothers. The association between EBF-termination and selected health and nutritional outcomes was investigated by both unadjusted and adjusted multivariate logistic regression. Covariates that could be consistently measured across the three surveys and that were found important in the literature were included in adjusted multivariate models [15,16,17,18]. They were maternal age at birth (≤19, 20–34, ≥35), place of residence (urban, rural), region of residence (seven divisions: Barisal, Dhaka, Chittagong, Khulna, Rajshahi, Rangpur, Sylhet), number of antenatal visits (no visit, 1–4 visit, >4 visit), wealth quintile (poorest, poorer middle, richer, richest), maternal education (none, primary, secondary, higher education), method of delivery (cesarean, vaginal delivery), birth weight (normal, low birth weight) and the survey years. We included ‘household use of solid fuel’ in the adjusted models for ARI, as some previous studies found this variable significantly associated with ARI [19, 20]. All analyses were adjusted for the complex survey design with necessary weight for sampling. Finally, the population attributable fraction (PAF) for each of the outcome variables was calculated using the following formula: \( \frac{\mathrm{Prevalence}\ \mathrm{of}\ \mathrm{exposure}\ \left(\mathrm{OR}-1\right)}{1+\mathrm{prevalence}\ \mathrm{of}\ \mathrm{exposure}\ \left(\mathrm{OR}-1\right)} \); where OR is odds ratio for exposure (in this context, not-EBF to EBF) [21, 22].

Results

A total of 1918 babies aged 6 months or below were included in our study. Around 56% were exclusively breastfed up to the first 6 months of birth. The mean age of mothers at the time of delivery was 24 years (SD ±5.59) and babies was 2.65 years (SD ±1.65). There were almost equal number of male and female babies. Majority of mothers (65%) were formally educated (at least primary) and did not have any formal occupation (85%). Around 42% of women were from poor wealth quintile. Mean number of antenatal visit was 2.59 times during pregnancy. Table 1 shows the socio-demographic characteristics of mothers and their babies.

Table 1 Breastfeeding, infant and maternal characteristics
Full size table

The prevalence of diarrhea was 8.3%. Around 42% of babies suffered from fever during the 2 weeks prior to the surveys. The prevalence of ARI was around 18.5%. Overall, almost half of the babies (48.9%) suffered from at least one of these three diseases during the 2 weeks preceding the surveys. The prevalence of stunting and wasting was 18.1 and 17.3%, respectively. Almost 30% of the children were underweight during the survey. Overall, 50% of children were found to have one of the three types of under-nutrition (i.e. stunting, wasting and underweight).

Table 2 shows unadjusted and adjusted odds ratios (ORs) and their corresponding confidence intervals for diarrhea, fever and ARI. EBF has a significant effect on each of these three diseases before and after adjusting for possible confounding factors. However, the effect gradually decreases with the increase in duration of EBF. If EBF was terminated during 0–2 months, 2–4 months and 4–6 months the odds for babies in getting diarrhea were 4.94 times (95% CI, 3.17–10.23), 3.07 times (95% CI, 2.11–5.03) and 2.30 times (95% CI, 1.89–3.20) higher, respectively, than babies for whom EBF was not terminated. Babies were 2.18 times (95% CI, 1.56–3.04), 1.53 times (95% CI, 1.37–2.10) and 1.23 times (95% CI, 1.06–1.63) more likely to get fever if EBF was terminated during 0–2, 2–4 and 4–6 months, respectively, than the babies for whom EBF was not terminated. Similar results were found for ARI (Table 2). Overall, the ORs of getting at least one of these three diseases was 2.50, 1.64 and 1.42 if EBF was terminated during 0–2, 2–4 and 4–6 months, respectively, in reference to the babies for whom EBF was not terminated.

Table 2 Association between breastfeeding and selected adverse health outcomes
Full size table

Table 3 shows unadjusted and adjusted ORs and their corresponding confidence intervals for stunting, wasting and underweight. EBF has a significant effect against underweight up to 4 months and an insignificant effect thereafter. If EBF was terminated during 0–2 months, 2–4 months the odds of babies of becoming underweight were 2.16 times and 2.01 times higher, respectively, than the babies for whom EBF was not terminated. Termination of EBF at three durations (i.e. 0–2 months, 2–4 months and 4–6 months) does not have any effect on stunting or wasting. The ORs of getting any of the three forms of under-nutrition was 1.54 (CI: 1.23–1.90) and 1.18 (CI: 1.00–1.47) if EBF was terminated during 2–4 months and 4–6 months respectively, in reference to the babies for whom EBF was not terminated.

Table 3 Association between breastfeeding and selected nutritional outcomes
Full size table

PAFs also show there are protective effects of EBF on adverse health and nutritional outcomes. This protective effect was strongest for diarrhea (27.37%), followed by fever (13.24%) and ARI (8.94%). Overall, around 10% of the reported illness attributable to these three diseases could be prevented if EBF was not discontinued during the first 6 months (Table 2). There were slight protective effects of EBF on under-nutrition; around 6% underweight, 2.21% stunting and 0.56% wasting could be prevented by ensuring EBF during the first 6 months. Overall, around 7% of stunting, wasting or underweight in Bangladesh could have been prevented by ensuring EBF up to 6 months of birth.

Discussion

Worldwide substantial adverse health and nutritional outcomes are attributed to lack of EBF [23, 24]. Results of this study suggest a protective effect of EBF against diarrhea, ARI and fever. EBF up to 6 months did not seem to cause under-nutrition, rather termination of EBF at 2–4 months were found to be associated with underweight. These findings of EBF with three nutritional outcomes, in fact, suggests that the concern around insufficiency of EBF to fulfill the nutritional requirement is not supported. Therefore, together, our findings suggest EBF up to 6 months is beneficial in protecting babies from infections and sufficient to fulfill the nutritional requirement. Overall, our findings are largely consistent with the recommendation of WHO for EBF during the first 6 months.

Worldwide, diarrhea, fever, ARI and under-nutrition remain the major killers of children under 5 years old (often known as under-five death). Of 10.4 million under-five deaths from preventable causes in developing countries each year, over 50% die due to under-nutrition [25] and 29% due to ARI and diarrhea [26]. These adverse health and nutritional outcomes cause frequent hospitalization, improper physical growth and create a momentum leading to the further morbidity, and frequent school missing [27]. EBF up to 6 months of birth is a feasible and healthy preventive measure against adverse health and nutritional outcomes. In our dataset the overall prevalence of EBF during the first 6 months of birth was 56%, which was 17% higher than the average prevalence of EBF (39%) in developing countries [28]. Clearly, this higher prevalence highlights a public health achievement for Bangladesh. This, however, should not be a reason for complacency, as around 46% of children experience some episodes of diarrhea or ARI during the first year of life and one third of total child death burden is attributed to diarrhea [15]. Therefore, the importance of EBF up to the 6 months of birth is crucial for Bangladesh, as the general hygiene practices and overall sanitation are inadequate.

In our analysis we found EBF up to 6 months could have prevented around 27.37% of reported diarrhea and 8.94% of the ARI cases. These findings are consistent to that reported in the previous literature [16, 17, 29]. Factors associated with the occurrence of diarrhea and ARI are broad – some of them are modifiable [3, 30,31,32]. The mechanisms through which breastfeeding have protective effects on infectious diseases are multiple. Firstly, human milk has specific immunologic properties that protect the infants from infection [33]. Secondly, the array of antimicrobial, anti-inflammatory, immunomodulatory protection, and bioactive molecules and compounds of breast milk create protections against infection [34]. Thirdly, breast milk promotes mucosal maturation, stimulating neonatal immune systems; limits exposure to the germs from foreign dietary antigens [35, 36].

We found a gradual decrease in the ORs of three durations of EBF (or EBF termination) on diarrhea, fever and ARI. This observation is interesting and important. A reasonable explanation of this gradual duration effect is that babies’ immunity is low soon after their birth. With the help of EBF and natural immunity gradually the body develops prevention capacity. In addition, children without EBF receive foods and drinks which could be contaminated [17, 22], and/or difficult to digest [37]. Particularly in developing countries the lack of hygiene and related knowledge increase this contamination, which is the main reason for high infection rate among children of lower socio-economic background [38]. These factors, together, may explain the gradual protective effects of EBF against infections.

Our findings about little or no significant association of EBF with stunting, wasting and underweight are largely consistent to that from the previous studies conducted in developing countries [39, 40]. The WHO estimates that inappropriate feeding of infant is responsible for one-third of the cases of malnutrition worldwide [41]. Complementary foods are necessary when breast milk alone is no longer able to satisfy the nutritional requirement of the growing infant. Too early or too late introduction may adversely affect the child nutritional status. Particularly in developing countries, an introduction of complementary food too early may cause frequent occurrence of microbial contamination and increase the risk of diarrhea and ARI [39]. Thus the weanling’s dilemma and the risk of morbidity and mortality associated with early introduction of complementary foods are concerns primarily in developing countries. This dilemma divided the public health experts and there are disagreements about the right time of introducing complementary food. Our study findings support EBF during the entire first 6 months, as this protects babies against infections, and that it does not cause insufficient nutritional intake, rather termination of EBF during the first 4 months could cause underweight.

It should be noted here that our study is based on population level data. Thus while our overall findings are supportive of EBF up to 6 months, there may be individual cases or settings where early introduction of complementary foods may deem necessary. For instance, in some developing country settings poverty compels mothers to work outside and far away from home that may necessitate to introduce other foods [42]. In a study in Myanmar, lack of financial resources was also cited as a reason for poor maternal nutrition, leading to reduced breast milk production [42].

The main strength of our study is a population level representative data of recent years and a relatively large sample size. Also exposure and outcome data were collected at the same time by imposing 2 weeks recall period, which is likely to reduce bias [18]. We also adjusted our results for a wide range of socio-demographic and health-related confounders. Moreover, unlike previous literature we provided independent statistics for fever alone. Our study has also some limitations. Our data were cross-sectional, therefore, the relationship is correlational only rather than causal. Secondly, it is possible that the temporal sequence of the early signs of infection and termination of breastfeeding were not adequately appreciated by a subgroup of mothers; infection might have been blamed for the termination of breastfeeding, rather than the reverse (i.e. reverse causality). Data collection within a short duration restricted our scope to take seasonal variation into consideration, which was found important for child morbidities [43, 44]. Also this study does not intend to assess the weanling’s dilemma and the adequacy of nutrition from EBF. Additionally, our data were based on participants’ self-report with no scope of validation by the interviewers. However, an evaluation of Demographic and Health Survey data found that the exposure and outcome variables were reasonably well reported [45].

Conclusion

Lack of EBF up to 6 months of birth has adverse consequences on the health and nutritional status of children. A substantial proportion infectious disease and under-nutrition could be prevented if EBF was ensured up to 6 months after birth. Our findings were consistent to the WHO recommendation regarding the public health benefit of EBF in the first 6 months of birth. We recommend taking further initiatives to promote EBF in general, and tailoring programs to those women who are not practicing EBF, in particular.

Abbreviations

aOR:

Adjusted Odds Ratio

ARI:

Acute Respiratory Infection

BDHS:

Bangladesh Demographic and Health Survey

EBF:

Exclusive breastfeeding

OR:

Odds Ratio

PAF:

Population attributable fraction

WHO:

World Health Organization

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Acknowledgements

The authors thank MEASURE DHS for granting permission to use the data. The authors also acknowledge the support of Department of Population Science, Jatiya Kabi Kazi Nazrul Islam Univesity, Mymensingh Bangladesh, where this study was conducted.

Funding

There is no funding source for this study.

Availability of data and materials

BDHSs data were collected from the MEASURE DHS. The authors are restricted in sharing or making the dataset publicly available. Interested readers can download this dataset after registering with the MEASURE DHS. Necessary information are available at: http://dhsprogram.com/data/Using-DataSets-for-Analysis.cfm.

Declarations

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Author information

Affiliations

  1. Department of Population Sciences, Jatiya Kabi Kazi Nazrul Islam University, Mymensingh, 2220, Bangladesh

    Md. Nuruzzaman Khan

  2. Department of Public Health, La Trobe University, Melbourne, Australia

    M. Mofizul Islam

  3. Department of Health Services Research and Policy, Australian National University, Canberra, Australia

    M. Mofizul Islam

Authors
  1. Md. Nuruzzaman Khan
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Contributions

MNK and MMI developed the study concept, analyzed the data and drafted the manuscript. Both authors have approved the final version of the manuscript.

Corresponding author

Correspondence to Md. Nuruzzaman Khan.

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Ethics approval and consent to participate

The National Research Ethics Committee in Bangladesh reviewed and approved the survey protocol. Data collection procedures were also approved by the ORC Macro (Macro International Inc) Institutional Review Board. These organizations follow international ethical standards to ensure confidentiality, anonymity, and informed consent. Necessary measures were taken to conduct the interviews in a private location and to maintain confidentiality of the information collected. It was also made clear to the informants that they had full right to refuse to respond any questions or to terminate interviews at any time if and when they want for any reason.

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Khan, M.N., Islam, M.M. Effect of exclusive breastfeeding on selected adverse health and nutritional outcomes: a nationally representative study. BMC Public Health 17, 889 (2017). https://doi.org/10.1186/s12889-017-4913-4

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Keywords

  • Exclusive breastfeeding; child health
  • Under-nutrition
  • World Health Organization recommendation
  • Bangladesh

BMC Public Health

ISSN: 1471-2458

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