B.B.
My son grinds his teeth too, and he's 3 years old now. He started around 6 months or so. His pediatrician, Dr Kappes, said that it's just something kids do when they are small. He said it usually stops after a few years and that it's not really strong enough grinding to cause problems. When my son went to the dentist, the dentist said the same thing. Hope that helps!