The information provided here is not a replacement for a doctor. You shouldn't use it for the purpose of self-diagnosing or self-medicating but rather so you can have a more informed discussion with a professional TCM practitioner.
In Chinese Medicine retarded growth in children can be treated by one herbs that we have on record. Here is the list below.
Because it is a herb specifically indicated to treat retarded growth in children as can be seen on Tortoise Plastron's page.
Its main actions are: Nourishes the Yin and holds down the Yang. Strengthens the Kidneys and strengthens the bones. Cools the Blood, stops uterine bleeding. Nourishes the Heart. Promotes Healing.