My son is 3.5yrs old, recently he is licking chalks, crayons etc. whatever I advised he can't control himself.. how can I over come the issue?? pls

A. Bans lochan you can use for your child this is highly rich in calcium and slowly will help in reducing down this habit of the child because it is actually going to taste like what your child like to eat but it’s totally healthy and safe to be given as this could possibly be due to an issue of PCA or could be deficiency of calcium to your child