Call a friend. Share babysitting with friends so that you can have a couple of hours to yourself once in a while. Be sensible about housework. Time spent with your child is more important than a sparkling clean house. While your child is napping, do whatever you like to do watch television, take a shower, take a nap, read the newspaper or do nothing at all.
Physical exercise is a wonderful way to get rid of stress.
Get otside and get some fresh air when you can. Learn to stop comparing yourself to other parents. Review your strong points and feel good about the good things you do for your child. Give yourself small frequent rewards. Keep a sense a humor.