The Safety 1st TriMate™ All-in-One Convertible Car Seat keeps little ones secure and comfortable, from baby to big kid. The grow with me car seat has three modes of use— rear facing infant car seat (5-40 lbs. and 19"-40"), forward facing car seat (30-65 lbs. and 34.4"-49"), and belt-positioning booster car seat (40-100 lbs. and 43.4"-52"), making our all in one car seat ready for every phase of your child's development. The seat's slim design—under 19" across without the cup holders—allows parents to fit three slim car seats across the back seat without sacrificing comfort. Seat pad is machine-washable and dryer-safe. You'll always get the best fit with the 3-position adjustable base, 1-hand-adjustable harness system, and 8-position headrest.