Breastfeeding: Biocultural Perspectives

activity adult American appear artificial associated babies behavior biological birth body bottle breast cancer breast milk breastfeeding cause century changes Chapter child Clinical compared continue countries cultural diet disease duration early edited effect evidence example factors feeding female fertility foods frequency function groups growth human human milk important increased individual infant death syndrome infant feeding infant formula intake International Journal lactation lactose intolerance less levels living maternal Medicine months mortality mothers natural nursing nutritional observed occur patterns Pediatrics period populations possible postpartum practices Press prevent primates prolactin promotion protective protein rates recent relationship relatively reported result risk role Science sexual SIDS sleep social societies suckling sudden infant death suggest tion United University variable variation weaning weight woman women York