Breastfeeding
This version is for MEDLINE. I had trouble using it as one string so entered each as a separate search and them combined them all.
infant ADJ feeding
neonatal ADJ feeding
breast ADJ feeding
breast ADJ milk
mother* ADJ milk
maternal ADJ milk
human ADJ milk
infant ADJ lactation
infant ADJ nutrition*
infant ADJ food
breastfeeding OR breastfed OR breastmilk OR "breast pump"