M.M.
I'm writing not because I have an answer but to affirm that you are not alone. My son is 23 months and has been in the 25th percentile; I would get really anxious about meal times, which I'm sure he picked up on and didn't really help him to eat. His 11 month old sister who is in the 75th percentile weighs nearly the same as him. My concerns have been more about his nutrition than what habits are forming. However, as others have pointed out to me, my son is developmentally on par, physically able, and by all appearances seems to be growing at a healthy rate. Based on other people's responses to my own concerns, I've tried going more with the flow and providing healthier snacks (not all snacks are bad- i.e. cut veggies like carrots, bell peppers, nuts) or 2nd breakfast (like someone else already wrote about). He began drinking more of his whole milk which has helped a lot in terms of him maintaining calories. Other suggestions I've tried include:
1) Adding soft nuts like cashews and almonds into the snack repertoire for calories and protein. Also, edamame (shelled soybean) is high in protein.
2) Fill an ice tray with a variety of healthy snacks that could be available for him throughout the day.
3) Take a week or so to actually track what he takes in. This made me feel better to see that my son actually had a variety of foods throughout the week rather than looking at just one meal or one day.
4) I've also just recently gone the smoothie route since he's taken an interest in watching the fruits/yogurt/etc get blended.
Another thing I noticed is that he would eat better in front of other people than just alone with me. Strange. And lastly, my son seems to do better when what I give him for meals are in small portions(2 to 3 bites for each item). I ask that he tries each thing at least once, and if he wants more of something, he can ask for it. But everything at least once. Someone suggested that perhaps my son was overwhelmed with everything before him and, thus the small portions/choices work better for him. We've had a better eating week than normal this week and he's even requested some of his old favorites, which surprised me. I know it's frustrating but hang in there. Good luck!