My DD is 9 months old now but weighs only 8.2kgs so she's still in the rear facing car seat. She absolutely hates her it and almost every journey is a nightmare with her screaming hysterically .
I went to visit family abroad a few weeks ago and they said we could borrow their car seat. When I got there I found it was the 9kg one (i.e. next one up, which is front facing). She was SO much better in it - a little bit of crying now and then but for the most part she was happy or slept.
I'm thinking of moving her up to the next car seat even though she's a bit under the weight limit. I believe one of the "requirements" for the next seat is that the child can hold his/her head up well - which she can being 9 months. She is little so many other babies would be able to move to this car seat before 9 months so I don't think the age is critical. But I haven't been able to find info on whether the weight is critical either - i.e. can they move up at 9 months even though they're not 9kg, or is that really unsafe?
Any views?
(The only family we have in the UK live an hour and a half away, so just not going on car trips is not really an option unless we never want to see family...)