Constant bickering

My husband & I never fought while we dated all throughout our first 2 1/2 years of marriage. Ever since our daughter was born things changed. (It's not our daughter's fault at all)

Now we are fighting over sex. He is always wanting to be intimate. I'm honestly never in the mood (maybe it's the hormones, but men don't understand that...). We have recently been fighting over financial issues. He is going to have to get a second job & I know he's stressed about it.

Anyone else who is constantly fighting with their SO? What do you do to stop?