It has been generally accepted that the potential for adverse effects from these hypoxic events are substantially offset by the crash protection afforded by these devices. Unfortunately, the portability of car seats and contemporary busy lifestyles are resulting in infants spending extended periods of time in the car seat for reasons other than transport. Callahan et al found in 187 infants that 94% spent greater than 30 minutes in seating devices including car seats each day. The mean time spent in seating devices was 5.7+/- 3.5 hours and ranged from 0 to 16 hours. Prolonged use of car seats in infants too young to sit unsupported may also potentially result in prolonged periods of oxygen desaturation.