Infant car seats are a good choice for new-born babies, but they don’t have the advantage of being switchable, meaning that you will have to buy a new car seat after they have outgrown it. Many new-born babies of average or larger size can fit inside a convertible car seat, and as long as they are secure, they are perfectly safe inside. Check to see if the convertible car seat comes with new born padding. It is important that your child fits comfortably within the harness straps available. Of course, infant car seats are designed to contain the smallest of children safely, so if you would like to make the switch from infant seat to convertible seat, this is a perfectly viable choice to make.