Maxi-cosi Pria All In One Convertible Car Seat, you can take comfort in knowing that you’ll have a safe, comfortable car seat for your child, from birth to 10 years old. Children can ride rear-facing, from 4-40 pounds; forward-facing to 65 pounds; and up to 100 pounds in booster seat mode. It may be the only car seat you’ll ever need. Converting the Pria All-in-One Convertible car seat to each new stage is simple and intuitive as it is stylish, so you can quickly make car seat adjustments. It allows for a wide range of adaptability with its 3-position recline, and 5 headrest heights, along with a QuickFit shoulder harness.