J.S.
I could not help but notice that you are a young couple and that could have a lot to do with it. Neither my husband or I were very mature at 21 when we married. He wanted his guy time and I wanted our time. We had a lot of fights during our first year of marriage but eventually it all worked out. We did not have children at that time either..thankfully.
It could also be that your husband is not quite ready to handle being a parent or is quite stressed things. Of course, I would definitely get myself covered just in case things reach that point and you go your separate ways. I had the same situation occur about 2 years ago with my husband and he claimed it was all my fault for being so demanding and not taking care of myself. When he realized what he would be losing and the fact that I gave it to God to deal with, he has changed. Granted, he and I went through this talking to other women online and viewing inappropriate sites from his end several times after he had promised to quit. My children are 8 and 4 so divorcing would definitely affect them and I do truly love my husband, just not his actions at that time.
We are still together and just celebrated 14 years of marriage. It was a rough road though. Keep your child in mind and talk things out..not yell them out. Think about how you treat him when he comes home and vice versa. If you attend a church, perhaps talking to your pastor or counselor about this could help.
I will be praying for you.
J. S.