Going to your baby when he cries is important. It will help him learn to trust you. The secret is to check on baby in a way that helps him go back to sleep. Wait for a few minutes before going in to see if baby goes back to sleep. If you go in too soon, she can't learn to comfort herself and go back to sleep on her own.
Some parents wake up the minute the baby starts moving around.
If that happens to you, you can move the baby's crib or turn down the monitor so you don't wake up so easily. If baby really needs you and cries loudly, you will still hear her and wake up. If baby doesn't go back to sleep, check to see if there is any problem that you need to help with. If you think one of these is a problem, take action and see whether baby goes back to sleep. Leave a night light on when you put baby down at night.