We currently have a Maxicosi Axiss for DD which goes up to 18kg. She's 2.9 and weighs 17kg, looking at her red book she will be 18kg when she turns 3 if she stays on this percentile. So my plan was to buy her the 2 way elite as that can be used with harness until 25kg but now I'm wondering if it us worth the money if she won't stay in it for very long. Obviously wished now I had bought it straight after the infant carrier. Us there a car seat that can be used wuth harness until longer than 18kg and then without harness until 36 kg? Also looked at car seats with impact cushion but they are also supposed to be used with seat belt from 18kg onwards.