It should be in the car seat manual if you have it. Ours says at 60cm height, which she almost is at almost 3 months
My car seat manual says 60cm, my partners says once they’re 11lbs. Think it depends on the brand of seat x
My cybex says above 60cm, which in a few weeks, think my 8 week old will be x
My cossato one says when she is 72cm long it can be removed. D
Ours is max 60cm which somehow he already is at 8 weeks so it’s come out!
Look at the manual for your model - our Cybex is 60cm and I took it out at 9 weeks. It actually says it on the car seat itself, so maybe yours does to?
Out maxi cosi says up to 85cm so we have a bit more to get there.
The car seat will say a certain length on it, but some babies have their height in their legs and not torso. I had a Cybex with my first and second, and my daughter had it in way past 60cm because she's all legs, and I couldn't get a good fit without it. I agree with the above comment - join a group for a fit check x
The manual should have the weight on, ours was 11lbs so we have now removed at 8 weeks x
Join one of the car seat safety groups on fb, they are good at giving fit checks for your car seat x