Hello
Good evening
Normal newborn should gain 20 to 30 gms per day.
If she must have gained 20 gms then she must be around 3.2 kg.
Please try to increase your milk by natural galactogogues like garlic,methi,oats,fish.
Mother milk is always best to the baby.
Only if Mother milk is low then start using formula
Next Steps
If any issues do video or direct consultation