This was a fun read! I want to note there is one likely hypothesis missing here: human breasts can feed babies other than their own. Crucially, human breasts keep producing milk as long as any baby suckles. Sharing breastfeeding in small communities might be advantageous to children reaching maturity, and the adults can have genetical survival stakes by being indirectly or even distantly related.
This was a fun read! I want to note there is one likely hypothesis missing here: human breasts can feed babies other than their own. Crucially, human breasts keep producing milk as long as any baby suckles. Sharing breastfeeding in small communities might be advantageous to children reaching maturity, and the adults can have genetical survival stakes by being indirectly or even distantly related.