LIZS, im sure in 9 months time im gonna have a similar dilemma.... my charges is 3 1/2 and pnly just over 12kg....
the chance of her being 15kg by the time she starts school next september is almost non existent! (and i somehow dont think its fair to make a school age child sit in a proper car seat, tho as she will only be 4 1/4 maybe she will have to?)
Also im only the nanny, and already i have 4 car seats of my own (only 2 charges!) cause im OBSESSED with them being strapped in PROPERLY in the best car seats!
Already her mum and dad put her in one with a back and booster for 15kg+ but i REFUSE to do that... (how would i ever forgive myself if we were in a crash and she was hurt... not even MY child! )
the other dilemma is that ther will be anotehr baby soonish and im not sure she'l be 15kg by the time baby is 9 months when baby will need ehr car seat!
Anyway she eats LOADS..... at least as much as me, sometimes more so im secretly hoping that just maybe she will put on a bit more weight.... she may be nearing 13kg now as she hasnt been weighed since before the summer and she does seem to have grown a bit, but come september guess ill have to re think the options!
I REALLY dont want another car seat for a few months...
I do also have a Britax Crusier + (for EMERGANCIES only, so im wondering weather to use that until she gets to be 15kg, but in the back of my mind i KNOW its not a very safe seat, but im sure its not that safe, more for children / babies nearer 9 kg then heavier (thats just MY opinion by the way!)
Oh what a dilemma! lol