The best replacement for convertible car seat is booster.

The best alternatives to convertible car seat are rated as following:
★★★★★  booster
★★★★  infant car seat
★★★★  travel system
★★★  infant carrier
★★★  booster seat
★★  toddler car seat
★  car seat
★  all in one
★  booster car seat
★  combination car seat
★  3 in 1
★  capsule
★  infant
★  5 point harness booster
★  rear facing
★  3-in-1
★  harness booster
  britax
  combination seat
  peg perego
  infant seat

Your alternative for convertible car seat is not listed? Suggest!
Speaking about convertible car seat, one probably shouldn't forget about travel system.

Other search terms related to convertible car seat and their ratings are:
★★★★★ travel system
You have in mind a companion for convertible car seat and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of convertible car seat in all years. Click on graph for more.
convertible car seat
booster
infant car seat