The word “percentile” can bring back cold sweats related to your SAT days, and now that your kid is getting measured and weighed every 10 minutes, you’re hearing it a lot. Whether the kid is in a high, low, or middle percentile in terms of height or weight, the only thing you need to worry about is consistency. A regular curve on the growth chart is a sign that everything is progressing normally; a steep climb or drop is something to look into.