C.W.
Hi M.
I would not worry too much about at this age. His teeth are not fully grown yet- and as long as it did not hit a nerve he should be ok.
There are a couple of things you might do- and most likely the dentist will "recommend" this- is to put a cap on the tooth- the issue with this is as his teeth continue to grow the cap will have to be replaced over and over- this can be expensive- so when my children broke off their teeth (two of them) we just waited until they were older to put the caps on- that way you can do a permenant cap that should not need replacment over and over.
The exception to this would be if the chip is really bad and becomes an issue with his eating or if it is cosmetically just really ugly- otherwise, I would wait until his teeth are fully grown.
good luck and blessings