Babies ride rear-facing until they outgrow the seat's height or weight limits. ... After that, kids graduate to booster seats. The great thing about convertible car seats is that they can be used for a longer time frame, but they're typically much heavier than infant car seats.abies ride rear-facing until they outgrow the seat's height or weight limits. ... After that, kids graduate to booster seats. The great thing about convertible car seats is that they can be used for a longer time frame, but they're typically much heavier than infant car seats.abies ride rear-facing until they outgrow the seat's height or weight limits. ... After that, kids graduate to booster seats. The great thing about convertible car seats is that they can be used for a longer time frame, but they're typically much heavier than infant car seats.abies ride rear-facing until they outgrow the seat's height or weight limits. ... After that, kids graduate to booster seats. The great thing about convertible car seats is that they can be used for a longer time frame, but they're typically much heavier than infant car seats.abies ride rear-facing until they outgrow the seat's height or weight limits. ... After that, kids graduate to booster seats. The great thing about convertible car seats is that they can be used for a longer time frame, but they're typically much heavier than infant car seats.abies ride rear-facing until they outgrow the seat's height or weight limits. ... After that, kids graduate to booster seats. The great thing about convertible car seats is that they can be used for a longer time frame, but they're typically much heavier than infant car seats.