To put a number on it, it usually takes about 20 to 30 minutes after feeding to generate enough milk for your baby, and about 60 minutes to replenish fully. The more often your baby feeds, and the more they empty your breasts, the more milk your body will produce.
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.
Ideally, you would pump as often as your baby would nurse. This may not be possible with your work/ school schedule. Most mothers find that pumping every 2-3 hours maintains their milk supply and does not cause them to become uncomfortably full.
If your breast doesn't feel full of milk, this is usually not a sign of low breastmilk supply. For most breastfeeding problems related to breastmilk supply, the answer is: “more breastfeeding.” Keep breastfeeding, keep pumping, and that will keep stimulating your body to produce more milk.
Milk production is a demand and supply process. As milk is removed from your breasts, your body is signalled to make more milk. The more frequently and thoroughly the breasts are emptied (though breasts are never truly 'emptied'), the faster they try to refill.
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.
Adequate hydration also is important for breast milk production. The amount of liquid you put into your body affects how much breast milk you can produce. I encourage women to carry a bottle of water for themselves in their diaper bag.
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.
Your breasts feel softer
This happens as your milk supply adjusts to your baby's needs. The initial breast fullness reduces in the first few weeks. At around 6 weeks, breast fullness is completely gone and your breasts may feel soft. This is completely normal and has no effect on your milk supply.
Increasing your milk supply will take time, so don't give up. Even dry pumps (when you pump but nothing comes out) sends a signal to your body that more milk is needed on tap, so it's getting the work done even if there's no output to show for it right away. Stick with it and you'll see the results after a few days.
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 called re-lactation. It's possible for the female body to come back from “drying up” and produce milk again. In fact, many mothers of adopted children are able to pump and use several methods in order to stimulate their bodies to produce milk, even if they haven't given birth!
NOTE: It cannot be stressed enough that the amount of milk you able to pump is NOT ever a reliable indicator of how much milk you are producing, nor how much milk baby is taking in. The healthy breastfed baby is usually much more efficient at getting milk from the breast than a pump is.
Some might feed every 90 minutes, whereas others might go 2–3 hours between feedings. Newborns should not go more than about 4 hours without feeding, even overnight.
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.
After breastfeeding, both the fatty tissue and connective tissue in your breasts may shift. Your breasts may or may not return to their pre-breastfeeding size or shape. Some women's breasts stay large, and others shrink.
If you are pumping before your milk comes in, you may be getting little to no milk. This can be for two reasons: Colostrum is very concentrated and your baby doesn't need much of it, so your breasts don't produce very much. Colostrum is very thick and seems to be more difficult to pump.
Possible causes of low supply
Your baby does not feed often enough. Nearly all babies need to feed at least 8 to 12 times in 24 hours. Your baby does not feed effectively at the breast. You have started using formula milk as well as breastfeeding.
If there is a continual delay in letdown from the breast it can lead to reduced milk supply. Babies are also really in tune with how their mother's are feeling. Your baby can totally sense when you are sad, stressed, or anxious.
The first hour after birth when a mother has uninterrupted skin-to-skin contact with her newborn is referred to as the “golden hour.” This period of time is critical for a newborn baby who spent the past nine months in a controlled environment.
The amount of milk your body makes depends on the number of times your breasts are emptied throughout the day. Draining the breast by pumping often, like your baby would be nursing, will build or maintain a good supply of pumped milk.
Caffeine. It's not just tea and coffee that contains caffeine, it's in chocolate and various energy drinks and soft drinks. It's wiser to cut caffeine out while breastfeeding as it's a stimulant which can make your baby restless.