Hello Mammas

My baby boy weighed 2.9 kgs at birth. He was never chunky and was always 1 kg short of the monthly 50th weight percentile. At 11 months he is 8.3 kgs and I am getting really worried if I have done something wrong. I am at my in laws and am being told he looks way too young for his age. He has genuinely started enjoying and eating solids at the 10 month mark. I m curious if I have caused some developmental backlog in my child by not being more persistent with solids before?