If you have not yet bought an infant car seat, you may not actually need to buy one. Many convertible car seats are safe to use immediately after baby is born unless they don’t meet the seat’s weight requirements. Whether you want to use an infant car seat is solely up to you.  Infant car seats typically can last a child up to a year old or maybe further, but after that age, they’ll need a convertible seat as they’ll outgrow the weight and height limits. You don’t have to switch your child from an infant seat until they’ve reached those limits. However, many parents and caregivers find babies enjoy a larger seat once they’re more mobile.