Our daughter just turned three, and according to her wellness check she's in the 25th percentile for weight and ~50th percentile for height. What's been unexpected is that even though she isn't that tall, a lot of people comment that she seems tall! I think that's because she has a skinnier build, so that makes her seem taller. She seems to be on track overall, and I don't really worry about her growth chart too often.
Our son is turning 5 in December, and is on the lower end for both height and weight. Lately though he's been gaining on both though, and I'm hoping that his next wellness check will bring him closer to the median! He used to be by far the smallest kid in his class (he's small and also a December baby), and now he seems to be closer to the average. We'll know more soon!
Do you worry about your kids' growth charts?