My 16 month old got really sick a while back and lost quite a bit of weight. She’s healthy now and eats all day. 3 meals plus snacks. Most of the day she’s walking around with some kind of food in her hand. She’s very active always running jumping climbing and playing. She isn’t gaining any weight. Her pediatrician isn’t concerned but I am. She’s only 22 pounds. She was 27 before she got sick. Does anyone have any tips to help her gain weight? Thanks!