When our son was about four year old, we were worried so much about his health. There were days that he wouldn't eat as much as he should have been. But there were days, too that he would eat a lot and that made my husband and I happy. Because of these two reasons, his weight was always on low percentile. And so we asked his pediatrician for best vitamins that would help him boost his appetite.She just advised us to buy an over the counter multivitamins for kids. Sure enough, after a week or so, Jacob's appetite is back and he gained wight, too! Some may say that vitamins don't help increase kid's appetite, but to our son it did. Why? Because the moment we stopped giving his his vitamins, his appetite is lost. He would eat alright, but only a little.