+1 to finding a new pediatrician. Your daughter sounds completely within the range of normal. For perspective, my 50th percentile 8yo is growing out of size 8s. Size 8-10 is ideal but since many clothing brands don't make that, she's sizing up to size 10, especially in anything where she wants more room, like pajamas. Her 10yo sister is 10th percentile for height and can still fit size 8 in most things, although like a PP said, needs size 7 for waist and size 10/12 for length. Both wear size 2 shoes (I'm shoe size 5.5 like PP). Get a new pediatrician! If you tell us where you're located, maybe we can suggest one.