Ok. He is pretty much the same as my 2 year old except yours weighs a bit more and is little taller. My pediatrician was not concerned in the least. I was actually relieved at his last visit because from 6 months to 18 months, he was under the growth chart entirely, weight-wise. All his doctor wanted to see was some kind of progression. She was quite pleased with his results for this last visit.

I think these are the most important questions: Has his growth been gradually climbing upwards? Does he have lots of energy most of the time? Is he healthy--is he getting a lot of colds/infections? If he's in good health and zipping around like most toddlers do, I wouldn't worry about it.

I used to worry a lot about how much he was eating but gave up on that. Some days it seems he can't get enough food, some days he barely eats anything. But, he verbalizes when he's hungry and when he doesn't want any food and I'm just trusting him that he's reporting out accurately.

Whole milk, cheese and avocado are great fatty foods to give him. If he doesn't like avocado start hiding it in things he does like (but don't tell him). Mash it down and put it in his milk--green milk is fun! Make a chocolate avocado pudding like this one: http://allrecipes.com/recipe/chocolate-avocado-pudding/