TWIN FEEDING FRENZY

i had my twins over two weeks ago and they were a week early , 37wks 2 girls 5lbs 6oz and 6lbs 1oz , and they lost allot of body weight about 11% and i had to supplement one rime befpre my milk came in. well ive had oversupply as i did with my first so i have a good supply of milk stocked and they are fed full, and ik they r growing good bc they went from 1oz to taking 2oz in a few days and now they take 4oz each , they literally turned 2wks today! is this normal?