In terms of health, you can generally consider your child to be growing well if they are "eating well, sleeping well, and having healthy bowel movements." If growth is slow without any specific health issues, it is necessary to check both genetic factors and the child's current condition.
We look into family history and, in particular, assess the child's 'Yin-Blood' (Yin-Hyeol) status. A deficiency in Yin-Blood is like having a strong fire in a furnace but not enough fuel; the child has sufficient Yang energy to grow, but often experiences slow growth and the accumulation of internal heat due to a lack of corresponding Yin-Blood.