The Safety 1st TriMate All-in-One Convertible Car Seat is built for growing with your child while keeping them secure and comfortable on the journey. This versatile 3 in 1 car seat is designed to accommodate children from birth to age 10: rear facing car seat for newborn to toddlers (5–40 lbs. and 19""–40""), forward-facing carseat for toddlers (30–65 lbs. and 34.4""–49""), and a belt-positioning booster seat for children 40 lbs and up (40–100 lbs and 43.4""–52""). Ideal for families with multiple children, the ultra-slim design fits three car seats across the back seat of most vehicles, making it a convenient infant to toddler car seat and big kid booster car seat. Beyond its easy installation, the TriMate features a 9-position headrest that adjusts with one hand and has a hassle-free harness system without complicated re-threading. This convertible carseat is equipped with visible belt paths for easy setup, making conversion between modes a breeze. Smallest passengers stay cozy with the soft, memory foam infant insert, while older kids will love the comfortable ride in this booster car seat. This car seat meets or exceeds Federal standards.