Fig. 2.

Estimates for the standardized mean difference (SMD) of breast-feeding (EBF, exclusive breast-feeding; MF, mixed breast-feeding) v. formula-feeding on weight loss at 3–6 months postpartum. Study-specific SMD estimates are represented by grey squares, where the size of the square reflects the study-specific statistical weight (i.e. inverse of the variance), and their 95 % CI are represented by horizontal lines. The centre of the diamond presents the pooled SMD and its width represents the pooled 95 % CI. Dewey et al.^{( 54 )} provided two results, one for primiparous mothers (effect size for primiparous mothers=1) and one for mothers of low-birth-weight infants (effect size for mothers of low-birth-weight infants=2)