It is recommended that newborns and young infants sit in a rear-facing carseat at a 45 degree angle (maximum). Some infant carseats have a built-in level indicator. Older infants should have less recline once they are able to support their heads. Forward-facing carseats should not be reclined. Though some forward-facing and convertible models are approved in a semi-reclined position, this recline does concentrate crash forces in the crotch so an upright position is preferred.
