As a society we struggle with the notion that breasts are primarily for lactation. Many people are more comfortable that breasts remain sexualised and are used to sell products rather than to feed small people. So it’s perhaps not surprising that when the small people grow slightly less small, we struggle even more. Some prefer that the breast is removed and instead the small human is fed from the milk of a different mammal with a rather different set of needs. But if we look at ourselves in comparison to our mammal cousins, we can see that breastfeeding to the World Health Organisation recommendations of two years and beyond, makes scientific sense. A weaning age of 2.5-7 years fits with when our permanent teeth erupt for starters. Perhaps they are called milk teeth for a reason!