Most of my customers having problem in measuring their kid. Yeah, it is not easy to measure if you are not a sewer. Since I am doing homemade clothing, so it is better for me to share an measurement image that I found from internet. Hope it helps to guide you guys while doing the measurement:
Image source1. Height2. Chest3. Waist4. Hip5. Waist length6. Arm7. Inseam (for pants)