BREAST STORAGE CAPACITY
The size of your breast has nothing to do with the amount of milk you will make. The size of your breast is determined by the amount of fatty tissue in the breast. The amount of milk you will make is determined by the amount of glandular tissue in the breast that makes milk. This glandular tissue starts growing during puberty. It increases during pregnancy and is part of what accounts for the increase in breast size during pregnancy. Everyone’s storage capacity is different.. just like every breast size is different. However breast size does NOT equal breast storage.
Small capacity: Approx 2-3 ounces per feeding/pump. Baby may need frequent feedings: 10-12 per day. Baby usually takes both breasts and may want each breast twice. Parent feels uncomfortable quickly between feedings and sees a supply drop with more than 3-4 hours between feedings
Medium capacity: Approx 3-4 oz per feeding/pump. Baby may feed 8+ times per day. Baby may take one breast or both breasts each feeding. Parent feels uncomfortable and see a supply drop with more than 4-5 hours between feedings
Large capacity: Approx 4-6 oz per feeding/pump. Baby may feed 6+ times per day. Baby may only take one breast per feeding. Parent may go up to 6 hours without seeing a drop in supply
XLarge capacity: 8+ oz per feeding/pump. Baby may feed 6+ times per day. Baby may only take one breast and parent may still feel full in that breast. Some babies may be gassy from higher foremilk intake as they may not drain the breast fully. Parent may go 6+ hours without seeing a supply drop. Parent may still feel uncomfortable between feedings depending on how quickly the milk fills the breast
All capacities have the same ability to feed baby well as long as the breast is routinely being emptied.