Answer:
Before epiphyses closure
Step-by-step explanation:
Somatropin is also known as the growth factor or Human Growth Hormone. The human Growth Hormone is involved in the growth of a cell, in the regeneration of cell and cell reproduction.
Epiphyses can be described as expanded, long, round ends of bones which are present in animals and humans. It helps in the growth of bone. Hence, the somatropin should be given to the child before the closure of epiphyses.