Weight Gain

Brittany • Baby Boy Born: 11/26/2018 Baby Girl Born: 6/15/2020

I tried to weigh my 2 month old on my FitBit scale, and it looked like she was 8lbs even. I go Thursday to the drs and we will get her all measured up but I am concerned shes still so tiny! my son was so big (9lbs 14oz) but she was born at 7lbs was 7.5lbs at 4 weeks I feel like my supply is struggling the last couple of days, I am anxious to see what the dr says but has anyone had similar experiences ?? My cousin who is also in this group had a baby at 7lbs on 6/2 and shes already 11lbs 12oz!! I am just a worried mama!