[nkrisc]

So? At 9 months my son had met many other kids and they are very observant at that age, even if you don't notice.

Was your kid different? Your comment is not a lot to go off of but I get the sense you haven't raised a kid.

[0-_-0]

How about newborns?

https://www.researchgate.net/publication/222673203_Sex_Diffe...