Congratulations on your new baby!!!! Is this your first? I'm expecting too but my due date is in March.
Okay, as for the hair, it is very very common for hair to change textures entirely, but most of the time it is temporary and u will go through the post partum shedding and your hair ought to return back to normal.
A friend of mine just recently gave birth to her son and her hair went from straight to wavy!
But now she's shedding her hair and everything is going back to normal. So, don't worry about it too much!!