DD is 8.5kg, and the chair says suitable until 9kg... but not to use once they can sit unaided.
I only just checked the instructions, so she's been sitting unaided for 2 months now with no issues.
So AIBU to carry on using it (she's in it 5-10 mins for my shower each day) and assume they're just covering themselves, or am I being awfully unsafe with her 