There is a subset of children who will have this condition, and the definition of this subset refers to these newborns who are born at full term, i.e., over 37 weeks, but whose birth weight is less than five pounds, another name for a full-term small sample child, or a full-term less than gestational age child. For this group of children, there are three types of children distinguished by weight and length. The first type, called proportional, occurs mostly in the early stages of the mother’s pregnancy and is mostly related to genetic factors, genetic defects, chromosomal abnormalities, or chronic diseases of the infected mother. The growth potential of these children is very low, and they have less chance of catching up after birth, i.e. it is more difficult to catch up with the level of full-term weight children. The second type is called non-proportional, which occurs mainly in the late pregnancy of the mother and is related to malnutrition or hypertension of the mother. This type of child, if given adequate nutrition after birth, can experience accelerated growth, i.e., can catch up to the level of a full-weight child. The third type is the mixed type, a mixture of the above two types is rare, and the incidence of congenital malformations in these children is very high, with growth and intelligence disorders and a poor prognosis.