Slow weight gain

[Strongecoffeeismydrug]

Is anyone else's baby gaining weight really slowly.
She's eating and sleeping well.pooing and weeing well.
Smiley and alert but just not growing.
Hv is now monitoring her weight fortnightly .
I wasn't really worried but the hv has made me a bit paranoid and strangers and friends who all tell me she's tiny grrrrr.
She's my third and formula fed just like her brother and sister were.

My eldest was very slow growing - he was investigated for everything they could think of. Eventually after several years back and forth to the hospital they declared him healthy and naturally small - he's 20 now and 5'10 and around 9.5 stone - slim but very healthy.