Oh lord. Weight anxiety. Now a distant memory (I seemed to let go of the worries when she was about 10-11 months old, she's now 20 months old)
It ruled me and my life. I was so upset, so paranoid and just looking everywhere for comments and slights. Everywhere I saw supposed chubby and contented babies.
My baby was born roughly 5 lbs at 35/36 weeks and lost a fair bit (because she was early I hadn't read up on b/feeding and weight loss in newborns) after birth. I breastfed exclusively and very frequently (1-6 months were essentially a babymoon, ever 1-2-3 hours FOR hours. In fact at 20 months I still feed round the clock)
I looked back at her photos now and they tell a different story. She was little and scrawny at birth (lots are) and chubbed up really really quickly. She never got rolls or anything and was always in clothes 3 months behind her actual age but was plumpish, had lovely luminous skin and was developing early. Rolling at a few weeks, talking at 9 months etc.
She was born in Singapore, where the Chinese prize fat babies (my paed said they give them extra bottles to achieve it) so I had lots of people do a sharp intake of breath when they asked her age.
My paed in Singapore never said there was a problem with her weight or my breastfeeding. I guess she was 25 centile at birth (although I never checked!) but went to the 9th and stayed on that line religously until she was 12 months, which was the last time I weighed her. Don't see the point.
For the record, she's longish, but still slender. You can see her ribs a little, she has the body of a slender 3 year old, rather than the chubby body of a baby. I'm small, my husband is tall and medium build.
Good luck and just wanted to let you know I understand your anxiety.