A convertible car seat can be used both rear-facing for infants and forward-facing for babies at least one year of age and 20 pounds. Weight ranges vary on these seats, so consider the height and weight of your child before purchasing a car seat. All car seats sold in the U.S. meet minimum safety standards, but based on my experiences as a child passenger safety technician, as well as the experiences of other techs, these car seats are easy to install in many vehicles, hold up well over time and are easy to adjust for proper harness fit.