A Multi Stage car seats (also called combination 3-in-1 car seats is a forward facing car seat with a 5-point safety harness. It's a combination between a forward-facing car seat and a booster seat. The main difference is the usage of the harness belt for a smaller child and then removing and just using the seat belt. Multi-Stage car seats cannot be used rear-facing. Multi-Stage 3-in-1 car seat helps protect your toddler, from 20-100 lbs. Graco & Safety1st are the most popular brands for combination car seats. Shop for your favorite model at BabyStyle.ca and take advantage of FREE SHIPPING!