Several. Heredity, hypothyroidism, zinc deficiency, and poor nutrtion in general.
Familial. There are many other causes- such as Normal variant: Familial short stature, constitutional short stature. Psychosocial deprivation short stature syndrome. Intrauterine growth restriction: Malnutrition: ... Chronic diseases like crohns and colitis Skeletal dysplasias and genetic conditions with chromosomal abnormalities such as turners syndrome etc.