<unk>  <unk>  babies are those whose birth weight lies below the 10th percentile for that<unk>  age.  They have usually been the subject of intrauterine growth restriction (IUGR), formerly known as intrauterine growth retardation. Low birth weight (LBW), is sometimes used synonymously with<unk> , or is otherwise defined as a fetus that weighs less than 2500 g (5 lb 8 oz) regardless of<unk>  age. Other definitions include Very Low Birth Weight (VLBW) which is less than 1500 g, and Extremely Low Birth Weight (ELBW) which is less than 1000 g.
There is a 8.1% incidence of low birth weight in developed countries, and 6–30% in developing countries.  Much of this can be attributed to the health of the mother during pregnancy. One third of babies born with a low birth weight are also<unk> .
Small for gestational age
Large for gestational age
Breech birth
Fetal hydantoin syndrome
Premature birth
Fetal alcohol syndrome
Gestational diabetes
Intrauterine growth retardation