<unk>  is the<unk>  of a baby at its birth. It has direct links with the gestational age at which the child was born and can be estimated during the pregnancy by measuring fundal height. A baby born within the normal range of<unk>  for that gestational age is known as appropriate for gestational age (AGA). Those born above or below that range have often had an unusual rate of development – this often indicates complications with the pregnancy that may affect the baby or its mother. 
The incidence of<unk>  being outside of the AGA is influenced by the parents in numerous ways, including:
Genetics
The health of the mother, particularly during the pregnancy
Environmental factors, including exposure of the mother to secondhand smoke, pp. 198–205
Other factors, like multiple births, where each baby is likely to be outside the AGA, one more so than the other
There have been numerous studies that have attempted, with varying degrees of success, to show links between<unk>  and later-life conditions, including diabetes, obesity, tobacco smoking and intelligence.
Birth mass
Birth weight
Human height
Body fat percentage
Perinatal mortality
Bone age
Pregnancy category
Prenatal care