Babies should be in a rearward facing car seat and should not be placed in a forward-facing seat until they weigh at least 9 kgs and can sit up unaided. Babies should be kept in a rearward-facing seat for as long as possible. Once your child is above the maximum weight for a rearward-facing seat or the top of their head is above the top of the seat they should be moved into a forward-facing seat. It is not important if their knees are bent in the seat, provided they are still within the seat’s weight range.
Convenience factor with this stage of car seat is that most models will have a carry handle enabling you to easily remove and carry the baby without removing them from the car seat especially handy if the baby is asleep and may also fit onto corresponding pushchair converting it to a travel system.