We recommend that your child remain in the first car seat, Group 0 or 0+ (0-13 months) i.e. facing backwards, as long as possible because this is the safest and usually the most comfortable position. As long as the back of your child's head is fully supported by the plastic shell, we recommend using the infant car seat. The length of the child’s legs is not an important factor here. It is extremely unwise to put a child into a larger, forward-facing car seat too early.