Fuck Doctors Your Opinion?

My daughter was born at 9 lb 1 oz but had breathing issues and went down to 8 lb 5 oz at 8 days old and then 8 lb 7 oz at 16 days old. We moved so she didn't get weighed again till June 24 th she was born May 6 th. She was 10 lb 7 oz at that appointment and today a week later is 10 lb 11oz. They are saying for me to give her 3 bottles of formula a day. Do you think I should be concerned cause she gained 14 grams a day instead of 20? Should I start giving her formula like they said? Im thinking as long as she doesn't not gain weight or drops down alot in percentile I shouldn't do it I breastfeed my son for 3 years without suplimenting.