Why are republicans against abortion and also against welfare?

First of all I am not a liberal so don't start with that...I am an independent and I agree with points from both sides. I am just curious how someone can be against abortion and welfare. Without abortion, women who can't afford kids will have them which means they will have to go on welfare for assitance. Seems like a no brainer to me. More abortion = less kids we have to pay for.