Do you care sharing with me how many ounces of milk does your 4 month old babies drink and how frequent? As I am planning to increase my baby's ounce but I am just afraid that I am going to overfeed her.

Babies will show signs that they are full. You can take note of these cues to see if your baby is full and do give less than more milk to avoid overfeeding your baby. If you want a precise amount, you may try out this calculator. However, I'd still advise you to listen to your baby's cues. http://www.enfamil.com/formula-calculator I direct latch her exclusively, so I can't tell the exact amount of milk that she is drinking.