Why does a 3 year old bite himself?

What percentage of body fat should a baby have? What is the difference between sequence of development and rate and why is important? How old do you have to be to get your ears pierced without an adult? Is it serious if a baby bumps his head? Can you move in with your aunt you are 16 and have a baby legally in va? Why do babies cry when? Did Naruto dad hated his son? What does it mean if you do not have your period every month and and i am a vrigin? Child coat hook height? How soon can i get on birth control after having my baby? Did Jacqueline Wilson's parents divorce? How can poor hygiene affect a baby's health in relation to formula feeds and sterilisation? Where is Brandon De Wilde's son? Is carnauba wax toxic for young children once applied on furniture - ie crib? How many inches does a human grow in a year? What size is a womens 5.5 equal to in kids shoe? How old do you have to be to sit in the front seat in victora? How long does the pre-natal stage last? Are your gums being sore a sign of early pregnancy? A couple has two boys what is the chance that the parents next child will be a boy?