My daughter is 2 1/2 and is 15kg. At the moment she is is a regular car seat which says it lasts to 4 years. However my 5 month old son is huge and is growing out of his baby car seat so needs to move up to her car seat in a couple of months. I don't want to buy her another car seat for this stage as she is getting too big for one. What I was wondering, from a safety point of view, is whether she would be safer in a high back booster seat (aged from 4 years or 15kg) or whether I would be better buying a high back booster which has a 5 point harness on which is suitable from 9 months to 11 years. The problem is I really can't afford to spend over £100 on one of these as I have to buy 4 of them for all cars. Are the cheaper ones any good?
I suppose what I am asking isis a cheaper 5 point harness safer than a good high back booster?
Thank you so much for your help. Any recommendations would also be appreciated