The maximum volume of milk in the breasts each day can vary greatly among mothers. Two studies found a breast storage capacity range among its mothers of 74 to 606 g (2.6 to 20.5 oz.) per breast (Daly, Owens, & Hartmann, 1993; Kent et al., 2006).
The amount of milk that a baby drinks from a single breast ranges anywhere from 30 – 135mL, though the average volume is about 75 ml. Your number of breastfeeding sessions per day may be anywhere from 4 – 13, depending on his or her appetite and how much milk is removed from the breast during each session.
Mothers who exclusively breastfeed twins or triplets can produce 2,000 to 3,000 g/day, although this involves nursing an average of 15 or more times per day (Saint et al., 1986). Women who express surplus milk for a milk bank have been shown to produce as much as 3,000 g/day (Macy et al., 1930).
If you're pumping for a freezer stash or to store milk for a future separation from your baby, try pumping shortly after you finish nursing – maybe 15 to 30 minutes. That way, your body will have an hour and a half or so to replenish breast milk for your next nursing session.
In an average fifteen to twenty minute breast milk pumping session, most moms express between . 5 ounces and four ounces of breast milk total.
No person is perfectly symmetrical, so it's no surprise that many breastfeeding moms find they have an uneven milk supply or less milk production in one breast than the other. It's very common to find that one breast produces less milk, and if you and your baby are comfortable, there's no reason to try to change it.
You may be told to keep putting your baby back to the first breast in order to 'drain the breast' fully. But if your baby came off the breast on their own, they will get more milk by moving to the second side. Most mums breastfeed from both breasts at a feed but it is possible to fully breastfeed from just one breast.
It's possible for one breast to make all the milk a baby needs and for a baby to breastfeed only from one side. Breastfeeding your baby on the basis of supply and demand (whenever your baby needs to be fed) is the key to making enough milk.
Increase pumping frequency
Generally, moms should be pumping every 3 hours. Pumping more often can help stimulate breasts to produce more milk. Moms can try pumping both breasts for 15 minutes every two hours for 48-72 hours. Then moms can return to their normal pumping routine.
Ultimately, if your baby has reached its birth weight and you're pumping enough milk during the day, it's okay to sleep eight hours without pumping at night. Keep in mind there is an adjustment period for your body as it begins to acclimate to the decrease in overnight milk removal.
It's important to remember that your baby is much more effective at getting milk from your breasts than a pump will ever be. A healthy, thriving baby will get more milk than you a capable of pumping.
Despite views to the contrary, breasts are never truly empty. Milk is actually produced nonstop—before, during, and after feedings—so there's no need to wait between feedings for your breasts to refill. In fact, a long gap between feedings actually signals your breasts to make less, not more, milk.
Newborns may nurse for up to 20 minutes or longer on one or both breasts. As babies get older and more skilled at breastfeeding, they may take about 5–10 minutes on each side.
Your healthcare provider would likely recommend that you continue to pump until your baby is able to breastfeed effectively and once you have a sufficient milk supply. Once this has happened, they will likely advise you to stop pumping and just breastfeed - and, of course, get plenty of rest in between.
Combining milk
If you pumped both breasts at once and the total amount of milk will fill one bottle no more than two-thirds full, you may combine the contents in one bottle by carefully pouring the milk from one sterile container into the other.
Use your breast pump to increase your supply
Again, the more frequently you empty your breasts, the more milk they'll produce. Use your breast pump to completely empty breasts after a feeding and to express milk from your low-producing breast between feedings.
In most women, however, the body makes more or less milk based on demand. In the early phases of breastfeeding, some babies prefer one breast over the other and, based on that, some mothers feed more on one side. Therefore, the breast that is not "used" as much does not produce as much milk.
Some babies are snackers – they nurse for a minute or two, take a break, and then go back. Other babies can drain the breast in two minutes and be satisfied for a few hours. It depends on how much milk you're making and your let down, too.
How Long Does Nursing Take? Newborns may nurse for up to 20 minutes or longer on one or both breasts. As babies get older and more skilled at breastfeeding, they may take about 5–10 minutes on each side.
If your baby's swallowing has slowed, they have started to fall asleep, and/or they seem frustrated at the breast, it's time to switch sides. Sometimes switching breasts multiple times per feeding can be useful, especially in cases of sleepy babies or low milk supply.
These sessions don't need to be evenly spaced, but you should be nursing/pumping at least once during the night in the first few months or anytime you notice a decrease in supply. Avoid going longer than 5-6 hours without pumping during the first few months.
Some mothers feel a tingling or pins and needles sensation in the breast. Sometimes there is a sudden feeling of fullness in the breast. While feeding on one side your other breast may start to leak milk. You may become thirsty.
How do I know whether my breasts are empty? There's no test or way to know for sure. In general, though, if you gently shake your breasts and they feel mostly soft and you don't feel the heaviness of milk sitting in them, you're probably fine.
Falling asleep at the breast is a normal behaviour and is mostly due to a hormone called cholecystokinin or CCK. CCK makes your baby feel full and sleepy and it is released in your babies gut as soon as they start sucking.
Exclusively pumping is harder than breastfeeding. It can feel very time consuming and overwhelming to pump, bottle feed and sterilise equipment while juggling a hungry baby. Being tied to a pump at regular intervals can be limiting especially when away from home.