C.H.
My son who is now almost 2 did the same thing every now and then. It is a normal phase that kids go through. Some times they suddenly start eating a ton other times they seem to barely eat. As long as he is still producing wet diapers, and is still eating something, don't worry so much. You can try offering small snacks in the day as well. It is most likely just a stage he is in and will probably be just fine.