Having the baby changed my relationship.

Not only has my bodied changed and now I feel unattractive but on top of that my SO and I have been arguing over everything since we've had the baby and when we aren't arguing we just have intense and emotional conversations. Sometimes I feel like the baby has changed everything and I know it's not the babies fault I just mean it has made my relationship almost unbearable. I don't want to leave my man but between feeling bad about my body and then on top of that arguing with someone constantly it just makes it hard to be happy when these should be some of our happiest moments. Any suggestions?