I don't think that the movie "puts down" c/sect births, rather it explains how a lot of them and augmented births end up happening.

Tali even though the birthing scenes are beautiful, the footage of what they used to do to women in labour is quite confronting and would be quite scary for a child. It shows old footage women being tied up and blindfolded
I would recommend that if you want to prepare your son for seeing a birth in the future that you watch it without him first so you can decide if he can handle the images. I wouldn't let mine see it.