Car Seat Question

sschwege

Another few months and DS will have outgrown his infant car seat.  So DH and I are trying to figure out what to do next.  Currently DD is in a convertible car seat.  She's still RFing though she's getting close to exceeding the height limit so it's only a matter of time until we will have to turn her FFing.  Anyway, I am wondering if we should get a five point booster for her or just buy another convertible car seat for DS.  Are the convertibles safer than the five point boosters?  TIA