My son, 2.5 years old. His head circumstance is small about 40centimtrs. He understood every thinks what we say and he do every actions in corect time but he doesn't speak all words and sentens. Only some words he speak now eg mummy, daddy, water etc. And the main problem is noticed that some times he do some activities repeatedly. That is eg of he open the door then closed then open then closed again again and another he step down then up and down then up again and again. Doctor, I think his brain is not developed as his age. Any solution for this disease. Please share me details. So thank you.