I know children who did not go to a childminder or similar at 1-1.5 years old – I did not like their development in terms of language and social behavior.
And unfortunately, Saruss overlooked exactly this component.
If you have read everything correctly, you know that this is not the case. A childminder does the same as a mother, only she has several children who are not her own. I also know negative stories about that!
I also know people who think it is best (for the child) to put them in kindergarten as early as possible. And I have always said "to each their own," but sometimes I do wonder why people have children (other than for retirement). This is not about anyone personally here. So just take it down a notch. Everyone is a little different, and that is a good thing.
In my case, it is not as if I hid my child in the basement for three years. For example, we have slightly older neighbor children, playgroups, relatives and friends with children, and many opportunities for movement thanks to the house and garden.
From a biological perspective, this is actually different from what others argue here with "natural tribes." The natural age for weaning is around 2 years, and humans as mammals are programmed by original evolution for family bonding (and long attachment to the mother). The fact that in the last few handfuls of thousands of years humans have done and can do this differently through food technology and social (regional) differences is a special case.