Getting Distant

I feel like my husband and I are becoming almost distant. We have a 15 month old and a lot of our energy and focus is on him. My husband has his hobbies and i feel like lately he'd rather do that then be around home or even do something with just me. I have that "mom guilt" that when I leave my little guy, I feel horrible. We've been married almost 4 years and sometimes I just don't feel like he likes me anymore... I'm so sad and just don't know what to do.