Newborn weight gain

srbmvp

Does anyone know approximately how much weight a newborn should be gaining per week? When my twins were born, they were only an ounce apart and have tracked pretty closely to each other up until this past week, now one is gaining faster than the other. I know all babies are different, even identical twins, just curious if we are still on track or not.

We are well above birth weight and diaper counts are good btw. Thanks!