Breastfeeding: then and now.
Over the centuries, civilization has survived because babies were breastfed. Although there has always been a small percentage of women (less than four per cent) unable to provide sufficient milk for their infants, the majority of women can produce enough milk to nourish twins and even triplets.
Hefti
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D001942:Breast Feeding; D005260:Female; D006801:Humans; D007227:Infant Nutritional Physiological Phenomena; D007231:Infant, Newborn