It seems like he's having trouble adjusting to the new reality. He may feel pressure to keep up career wise, even if that pressure is not coming from you. My suggestion: outwardly don't capitulate...keep holding him responsible for his shared role as a parent. Inwardly, cut him slack and be patient while he adjusts.

One of these days you may find yourself at a crossroads. It's nice to have a partner willing to put up with you while you find your own way.