The mice were born weighing 40 percent below average.

Their son, Austin, was born weighing just 2 pounds.

Infants who are born weighing less than 2500 grams.

And though her 4-year-old son is fine now, he was born weighing less than two pounds and spent several months in intensive care.

A single calf is born weighing about two pounds, after a gestation of 183 days.

The percentage of low birth-weight babies, those born weighing less than 2,500 grams, was the same in both groups, 16 percent.

In 1987, 69 of 1,000 babies were born weighing less than five and one-half pounds, which is considered low birth weight.

Alourdes's daughter, Maggie, was born weighing 17 pounds and 10 ounces.

At greatest risk are those born weighing less than about two pounds.

To be considered very low birth weight, a child must be born weighing less than 3.3 pounds.