Lazy husband??!

I love my husband, but he doesn't help me at all with our son. When I ask him to help me change Waylon's diaper, he gives me excuse after excuse. It's like pulling teeth. I am getting so burnt out because he won't help me. When I call him out on it, he gets very defensive. I don't know what to do anymore. I'm so frustrated. I get he works, but so do I. When he is home, his duties as a father starts. Once I asked him to help me give Waylon a bath, and he said "it doesn't take two to dump water on our sons head!"