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First breath - a newborn's reflex reaction to changes in blood composition, release, which causes an increase in circulating blood pressure and new stimuli: cold, light. In a healthy newborn, it occurs within 30-60 seconds of birth. During labor, the chest is compressed to fit the dimensions of the woman's birth canal. The fetus is born apnea. The first breath causes the chest to expand suddenly and at the same time creates negative pressure in the pleura of the child. There is an increase in blood flow through the lungs and lung expansion. The capacity of the first breath is about 50 ml of air. Surfactant found in the alveoli of full-term newborns prevents their collapse and reduces surface tension. His presence is a condition for proper breathing of the newborn after delivery.