Lack of vitamins can trigger depression. Take time out for yourself. There is nothing wrong with having someone watch your new baby while you go out for a couple hours. Fresh air and sunshine will do wonders for the soul. Take your baby out for walks or even just to sit out in the yard.
Sunshine increases the production on seretonine in the brain and is a natural mood elevator.
Being outside will make you feel less housebound. Anytime you need help with your baby or even yourself, make sure you talk to someone. It can be a close friend, your parents, minister or your doctor or babies pediatrician. Help is always available. Remember that everything passes in time.