This is supposedly suitable from 9 months and my ds will be 18 months when number 2 is born. It doesn't have a 5 point harness but seems fairly adjustable in terms of getting a good fit with adult seatbelt etc. Reclines too so ds might be able to sleep a bit on lone journeys.
I really don't want to buy another seat like the one we've got (britax ecplise) and want to move ds into the next stage car seat so that buba can have his rear/front facing one!!
So do you think 18 months is too young for the Indy plus with adult belt??
(should add that ds is a tall boy but not at all going through a chubby phase..I expect he'll be very skinny when he gets walking!!)
We have just got this for DD, who is 2y 10m. We got it as we wanted the Isofix system, and not many do it still.
It does use the seat belt though and if I am honest I wouldn't have wanted to se it with DD at 18 months. I only feel confident using it now she is nearly 3 - which is the age they say for most seat belt type booster chairs.