Not gaining weight.

So my daughter has been the same 16 lbs since 9 months. At her 12 month appt she still weighed 16 lbs.

Doctor didn’t seem concerned as she is very tall and she is following milestones.

However, I’m concerned and other ppl keep making comments about why is she so tiny 😔 and many of my friends or family members have kids and their babies were/are chunky and not as small as my girl :(

Should I be worried?

Also what should I give her to help her gain weight? I heard pediasure is good.