I've been a stay at home mom for three years and I can tell you that as a new mom I had a tendency to take on way too much, because before I could handle it but once the baby was there he took all my attention and time. Since I was staying at home I thought I could do everything and keep up with it, but the baby pretty much consumed me. He took every ounce of energy, focus, patience, second that I had. Sometimes you're lucky to get a shower.
Take care of your baby and yourself at least until you are both sleeping through the night. And until then don't worry about work.