Hi everyone, I’m interested to know when we are supposed to switch from a convertible car seat to a booster. My 4yo is in the 98th percentile for height so I’m just wondering when others switched. My daughter is 5 months old so I’d like to know if I’m going to have to buy a new convertible seat for her, or if I’ll just be able to use my sons for her. I think she’ll fit in her infant seat for another 6 months, so my son would be 4 1/2 by then. If we have to buy a convertible for her I’d like to know now so I can take advantage of any sales over the next few months. Thanks!