Fetal Growth Problems

Fetal growth restriction is a condition in which an unborn baby is smaller than expected for the number of weeks of pregnancy (gestational age).

Very low birth weight is a term used to describe babies who are born weighing less than 3 pounds, 4 ounces. It is very rare that babies are born this tiny. Only about 1 in 100 babies born in the U.S. are very low birth weight.

Low birth weight is a term used to describe babies who are born weighing less than 5 pounds, 8 ounces (2,500 grams). An average newborn usually weighs about 8 pounds. A low-birth-weight baby may be healthy even though they are small. But a low-birth-weight baby can also have many serious health problems.

Small for gestational age is a term used to describe babies that are smaller than normal for the number of weeks of pregnancy. These babies have birth weight below the 10th percentile. This means they are smaller than many other babies of the same gestational age.

Large for gestational age is used to describe newborn babies who weigh more than the usual amount for the number of weeks of pregnancy. Babies are called large for gestational age if they weigh more than 9 in 10 babies of the same gestational age.