The rate and depth of breathing in new‐born infants in different sleep states

1. Ventilation was recorded on ten male and ten female healthy full‐term infants during the first week after delivery, using a trunk plethysmograph. Tidal volume (VT), respiration rate (f) and pulmonary ventilation (V̇) for each respiratory cycle were measured during periods of rapid eye movement sleep (REM) and during quiet sleep when eye movements were absent (NREM).