Never use a rear-facing child restraint in the front seat of a car fitted with an active frontal airbag.
Consideration should be given to traveling rear-facing when a wheelchair user cannot use a safety belt or harness for some reason.
It is safer to leave the baby rear-facing for as long as possible though, so when baby outgrows the infant seat opt for a convertible seat that can rear-face up to 30lbs.
Convertible car seats are first used as rear-facing seats until your child is old enough or weighs enough to move to a front-facing seat.
Infants who weigh 20 lbs (9 kg) before they are one need a restraint approved for the higher weight and should also be rear-facing.