millions of men are part time dads. He'll do just fine. You've made your decision. No reason to second guess it.
Put yourself and your baby first. In time, the three of you will find a balance that works for you. This might even be the catalyst for real change within him. Maybe. Well, there's a chance.
Move on to the next chapter of your life. The adventure begins. I can not tell you how wonderful having kids has been for me.
good luck.