Getting your baby to smile for the camera long enough to take a perfect picture can be a challenge. Using BabyCam's sound button to play one of the app's fifteen prerecorded noises bells, drums, doorbells and songs including "Mary Had a Little Lamb," helps. For pictures of your kids in action try QuadCamera, which takes four to eight continuous pictures and then turns them into one image. (Baby Cam $.99/QuadCamera $1.99)