Here is some information on when we suggest using and removing the padding on the Mercury car seat:
Birth - 50 cm: Use all padding
50cm-60 cm: Can remove the side padding
60cm-80 cm: Can remove all the padding
50cm-60 cm: Can remove the side padding
60cm-80 cm: Can remove all the padding
The Mercury car seat is an I-size model meaning it is tested to babies height rather than weight.