If a kids still got 9 baby teeth and he is 12 year old will that stop his grow till real come in?

It is not uncommon for some children to retain their baby teeth until they are 12 years old. In most cases, this will not impede their growth or the eruption of their permanent teeth. The permanent teeth will eventually come in, even if the baby teeth have not yet fallen out. However, If you are concerned about your child's dental development, it is always a good idea to consult with a pediatric dentist.