pauline,
depend on 你去邊個州..
mostly 佢哋以歲數劃分,
NYC by law, 7-8歲以下都要坐booster.
你租車時同租車公司講, 小朋友歲數, 佢哋有car seat 租
as 我去LA, FL 玩, 都係租車喥租 car seat for Amanda.
infant within 12 months 係infant care seat
toddler over 1 years old to about 4 years old 用 convertable car seat or 一般高背 car seat
over 4 years old 可以齋坐 booster.