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cryptorchidism and p. 675
low birth weight with p. 658
murmur in prematurity p. 298
neonatal respiratory distress syndrome and p. 685
common cause of death p. 277
Preterm birth is defined as the birth of a baby at less than 37 weeks of gestational age. The earlier a baby is born, the greater the risk, variety, and severity of complications to the infant's health, particularly to the respiratory system. The earliest gestational age at which a baby has at least a 50% chance of survival is approximately 24 weeks. Signs of preterm labor include frequent and painful uterine contractions, vaginal bleeding, cramping, and lower back pain.
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