there are a lot of interesting gendered behaviors. for example boys tend to prefer playing with car toys and girls with doll toys. they also have different playmate preferences and boys tend to play more "rough" with each other. if i recall there are differences in what they tend to draw too. and all those behaviors correlate with testosterone levels in utero. toy preference has also been seen non human primates, further suggesting raw biological rather than social origin.

i wrote about many of these differences before: https://staging.busy.org/@tychoxi/sexual-development-of-the-brain