They can get tummy upsets as they get used to digesting food. Make sure he is getting enough milk, and maybe slow down on the solids for a few days if he is still having issues.

We will be starting bls in a few weeks (although he has already sucked on a chip he stole and spat on my apple). He is way more interested than DD was at this age. I think i will go a bit slow cos he still has tummy issues and skin issues that we are trying to get under control and i don't want to complicate it too much too soon.