I think it's bold and agree with the premise. Gender stereotyping starts before or as soon as a child is born in many, if not most societies.
I have some reservations about only referring to him as "The Infant" for the time that they did that, and also think it's naive of them to think that he would not be influenced by societal expectations or perceptions. I think there are less drastic ways of achieving the same thing.
I'm very happy that he's encouraged to play with a variety of toys and do various things, though - that's one of the big ways adults actively or subconsciously encourage gender stereotyping at an early age.
As a kid, I remember that I played with all kinds of toys - toy cars and trucks, little action figures, stuffed animals....my mom especially was very aware of gender stereotypes and potrayals.