S.C.
Dear J.,
A few others mentioned not being to concerned with the percentile, which I agree with, provided it's not a sudden drastic change. My daughter is 16 1/2 months & still hasn't hit 20 lbs. She is actually just below the bottom of the chart, but her doctor isn't concerned b/c she's not much below & her drop wasn't sudden or drastic. Unfortunately, as you've discovered, kids' likes and dislikes can change "at the drop of a hat", and so can their eating habits. My daugther is like that, too. Some days she'll eat more than her five year old brother, and other days, I want to pull my hair out b/c she doesn't seem the least bit interested in eating anything at all. I think someone else mentioned it, but keep an eye on the liquids. Also, you might want to start writing down what & how much he eats, along with the time. This might give you a better idea of how much he is eating (and drinking). Continue to offer a variety of healthy foods, and try to avoid any "junk" food. I learned the hard way, that the "sweet" rewards habit is easy to develop, but HARD to break! Hope you find the ideas helpful. Have a GREAT day!