25-29 wks’ gestation  

• Virtually all infants will experience apnea of some sort

• Infants born at < 26 weeks may experience apnea until > 40 weeks

30-32 wks’ gestation

• ~ ½ of infants will experience apnea of some sort

34-35 wks’ gestation

• Less than 10% of infants will experience apnea of some sort

37-41 wks’ gestation  

• Rare event