Does he actually like his job? It sounds to me like he resents that you get to stay at home while he works. Is it possible he feels under pressure as the sole breadwinner?
Just playing devils advocate as my DH hates being the sole breadwinner. So I work part time because I enjoy it but also it (strangely enough) makes him appreciate me more as he has to step up his work around the home.
This is just something I've noticed in my relationship. My Dh is far from a pig but I have noticed an element of resentment when I haven't been working.
How old is your child?