“…The SMD was −1.78 (CI, −2.35, −1.22) for acute distress (n=792; data from 8 studies). 22 , 23 , 25 – 27 , 29 , 30 , 33 For distress during the acute plus recovery phase (n=424) the SMD was −1.89 (CI, −3.19, −0.59). Considerable heterogeneity was reported for this outcome, which can be explained by the potential differences in the implementation of the intervention (breastfeeding and the control group) and age of the infant (studies included infants less than 24 h of age to up to 12 mo).…”