Yes, five-point harnesses wrap around a baby's shoulders and waist preventing escape and injury. By the time a child is able to climb though, a three-point harness is all that is really necessary and just becomes another obstacle for a tenacious child. Babies under a year are much safer with a five-point harness. A crotch post is one of the most important aspects along with the harness. It keeps the baby in the seat while you secure them with the harness. Also, the crotch post prevents the baby from slipping around and keeps them more stable.