Taken from Infa website ( my son's carseat).The correct height for the shoulder straps is very important for the optimum performance of the restraint. The shoulder straps must be positioned no lower than 25mm below the top of the child’s shoulders. If the harness straps are more than 25mm below the level of the child’s shoulders then the child is too large for the restraint and should not be used
It's possible that all seats are different though.





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