Trends in Weight Gain Among Breastfed Infants Versus Bottle-Fed Infants at a Tertiary Care Hospital in Karachi, Pakistan

Background Infants need to be exclusively breastfed up to six months of age, and breastfeeding should be continued up to two years of age along with complementary food. In Pakistan, the majority of newborns are not exclusively breastfed. This study was done to compare weight gain between breastfed infants and non-breastfed infants at a tertiary care hospital in Karachi, Pakistan. Methodology This observational cohort study was conducted at the well-baby clinic and vaccination center of the National Institute of Child Health, Karachi, Pakistan, from January 2021 to December 2021. A total of 360 normal term babies (180 in each group) with age below 11 months on either exclusively breastfeeding or other milk feed were included. Data were collected by the duty senior staff nurse of the well-baby clinic and monitored on daily basis by the researchers. The sociodemographic characteristics of mothers of breastfed and non-breastfed babies and birth weight, length, and BMI Z scores of babies in both groups were compared. Results In a total of 360 babies, there were 192 (53.3%) boys and 168 (46.7%) girls. Overall, the mean maternal age was calculated to be 28.1±6.2 years, ranging between 18 and 37 years. The employment status of mothers (p=0.0117) and monthly income of parents (p=0.0388) were significantly different between groups. The mean weight gain in the exclusively breastfeeding group was 4.0±0.5 kg between the first and fifth visit (final visit) in comparison with 4.5±0.5 kg in the non-breastfeeding group (p<0.0001). Conclusion Non-breastfed babies gained significantly more weight in comparison with exclusively breastfed babies. More multicenter trials involving a large proportion of populations are needed to further verify the findings of the present study.