It's not done because:
1. majority of humans become lactose intolerant after a certain age. Caucasians otoh (Europeans, Middle Easterners, North Africans, and Southern Asians) developed a mutation to break down milk in adulthood due to the reliance and domestication of cattle. That's why most non Caucasoid cuisines have little to no dairy in them
2. Women stop producing the mild soon after the kid stops drinking it. The kid stops drinking it because of no. 1 and because new food sources are introduced which makes him less reliant on breast milk.
3. The early weaning of kids from breast milk prevents sibling rivalry and for women to have more children to care for.
Global Warming, it's a personal decision innit? - Nigel Tufnel
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