Breastmilk is easily digested. Breastfed babies have higher IQ's. Breastfeeding encourages bonding. Breastfeeding satisfies the baby's intense needs to suck. Breastfeeding promotes physical contact with mother, offering additional stimulation to baby.
Baby breastfeeds frequently which promotes frequent physical contact between mother and baby.
Breasts provide a comfort station for a toddler who needs to connect often. Toddlers who breastfeed tend to have the best social adjustment. Breastfeeding keeps mothering hormones flowing which increases bonding. Breastfeeding is an incredibly rewarding feeling for the mother. Breastfeeding hormones help relax the mother.