Ok, thank you! Never tried to measure her, will have to give it a go, although her head is nowhere near the top currently at 9 months. No idea what she weighs either!
As above, when they are getting close to the height or weight limits or when their head is at the top of the shell.
Most infant carriers go to 13kg I believe so you should be ok yet. I just put my little on the floor and used a dressmakers tape 😂 she is only 4 months though so can’t escape yet 😅
The only VISUAL one would be the head being above the top of the seat (thus being too tall) but you should be able to roughly measure them before it gets to the point to know they’ve exceeded the height limit). Or by exceeding the weight limit