Geeky is good. Funny and geeky is even better. ThinkGeek has both angles covered with their hilarious baby tees. Like this input/output shirt, $12.99. Heh heh, output.
This onesie made my programmer sweetie soda-snort-laugh, and while I don't exactly get the first line I do get the punchline. Mostly IP onesie, $12.99.
And lastly pookies and parents can match with these adorable tees, that would, incidentally, make a great new daddy present.
and for daddies, Version 1.0, $15.99-$17.99
After all, why wouldn't you want to raise your baby to be curious, interesting and smart? Geeky really is good.