Premature infants
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Premature infants are babies born before full-term gestation.
A fair percentage of babies who are pre-term by estimation of a calendar due date have characteritics of full term babies. One study 3 comparing sonographic with menstrual dates from a large database found that only 78% of pregnancies designated preterm (less than 37 completed weeks) by menstrual dates were actually preterm, according to a confirming sonogram.