Is he overweight? My 21 month old daughter loves to eat but is actually skinny. She begs food from the neighbors and always wants what the other friend has. Since she's not overweight at all, I am glad she's eating because she needs it. She is so active and obviously burns it off very fast so I'm not concerned. I think your son is very young and that toddlers need food about 5 times a day, three meals and two snacks. Yes, they do seem to eat all day long, but they need it. I would try not to worry unless his numbers were off and he has "moon face" and cranky and possibly not sleeping well. Good luck and I hope your son's doing well! Julia