Losing interest in your husband

Recently I have lost complete interest in my husband. He's not attractive to me. I don't like spending a lot of time with him. I don't feel special with him. But some how he is my friend.

We have a 3 and a half month old together. I know he loves her, but when it comes time for him to watch or take care of her, he very rarely plays with her. He just holds her and has her watch something with him.

I also feel since we have been married, he feels like he doesn't have to "chase after me" anymore. Or he doesn't have to try anymore. That makes me not want to try with him either. It's almost like we don't like each other anymore.

What do I do?