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FACTS

  • Babies born weighing less than 5 pounds, 8 ounces (2,500 grams) are considered low birth weight.
  • Low birth weight babies are at increased risk of serious health problems as newborns, lasting disabilities and even death.
  • About 1 in every 13 babies in the United States is born with low birth weight.
  • Advances in newborn medical care have greatly reduced the number of deaths associated with low birth weight. However, a small percentage of survivors develop mental retardation, learning problems, cerebral palsy, and vision and hearing loss.

Why are babies born with low birth weight?

There are two main reasons why a baby may be born with low birth weight:
  • Premature birth: Babies born before 37 completed weeks of pregnancy are called premature. About 67 percent of low-birth weight babies are premature.
  • The earlier a baby is born, the less it is likely to weigh and the less developed its organs will be.
  • Very low-birth weight babies: (Those who weigh less than 3 pounds, 5 ounces or 1,500 grams) have the highest risk of health problems.
  • Small-for-date babies: (Also called small-for-gestational age or growth-restricted): These babies may be full-term but are underweight.
  • Some of these babies are healthy, even though they are small. They may be small simply because their parents are smaller than average.
  • Others have low birth weight because something slowed or halted their growth in the uterus.
  • Some babies are both premature and growth-restricted. These babies are at high risk for health problems.
Sources:
  1. http://www.marchofdimes.com/professionals/14332_1153.asp
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