Appreciate the pause from your career (you‘ll probably get a new outlook on things), maybe view it as a personal development sabbatical. Schedule less work if you can, so you can sleep a bit during the day. DON‘T hesitate to ask people for help, even if you don’t want to be a burden and all - People know that life is hard for new parents, and most want to be useful in some way - it makes them feel good about themselves.