You can’t meaningfully increase your overall milk supply while still pregnant, because full milk production doesn’t begin until a few days after birth. What you can do during late pregnancy is start hand-expressing colostrum, the thick, nutrient-rich first milk your breasts begin producing weeks before delivery. This practice helps you build a small frozen stash, gives you confidence with the mechanics of expression, and may support an easier transition to breastfeeding once your baby arrives.
Why Full Milk Production Waits Until After Birth
During pregnancy, high levels of progesterone actively suppress the signals that trigger copious milk production. Your breasts are developing the tissue and ducting they’ll need, but the switch to producing larger volumes of milk only flips when progesterone drops sharply after delivery of the placenta. This process, sometimes called milk “coming in,” typically happens two to five days postpartum regardless of what you did during pregnancy.
What your breasts do produce in the final weeks of pregnancy is colostrum. It’s made in very small quantities, often just drops at a time, but it’s concentrated with antibodies and calories designed for a newborn’s tiny stomach. Collecting this colostrum before birth is the most practical thing you can do during pregnancy to prepare your milk supply.
When to Start Expressing Colostrum
The general recommendation is to wait until after 36 weeks of pregnancy before you begin hand expression. Before that point, nipple stimulation carries a theoretical risk of triggering uterine contractions. Research from Yale School of Medicine found that nipple stimulation does increase uterine contractions, though interestingly not through a sustained rise in circulating oxytocin. The hormone appears to release in rapid, short-lived pulses rather than building up in the bloodstream. The full mechanism isn’t well understood yet, which is one reason providers recommend waiting until the pregnancy is considered full term.
You should not attempt prenatal expression if you have any of the following: cervical insufficiency, a cervical suture (cerclage), a history of threatened or actual preterm labor, excess amniotic fluid (polyhydramnios), or any vaginal bleeding. If none of these apply and you’re past 36 weeks, prenatal hand expression is generally considered safe.
How to Hand-Express Colostrum
Start by washing your hands thoroughly and having a sterile collection container ready. Because colostrum comes out in such small amounts, a 1 to 3 mL syringe works better than a bottle or cup. You can buy these at any pharmacy.
Before you begin, gently massage all around both breasts for a few minutes to encourage flow. A warm flannel or expressing right after a shower can also help. Then position your thumb and one or two fingers in a “C” shape around the nipple. To find the right spot, start from the base of the nipple and gently “walk” your fingers outward until you feel a subtle change in breast texture, usually about 2 to 3 centimeters back. This is where the milk ducts sit.
Once positioned, gently compress and release in a rhythmic pattern. Don’t squeeze the nipple itself. After a few cycles, tiny beads of colostrum should appear. Express one breast for two to three minutes or until the flow slows, then switch to the other side. Go back and forth so each breast gets expressed twice per session.
What to Expect in Terms of Volume
Most people collect between 0.5 mL and 2 mL per session, though it can be more or less. That might seem like almost nothing, but colostrum is incredibly concentrated. A newborn’s stomach on day one holds only about 5 to 7 mL, so even small syringes of frozen colostrum can cover a full feeding.
Don’t be discouraged if you see only a few drops at first. Volume tends to increase slightly with practice, and the act of expressing itself helps you learn the hand movements you’ll rely on in those first days postpartum. Some people never get more than a few drops per session during pregnancy, and that’s completely normal. It says nothing about how much milk you’ll produce after delivery.
Storing Colostrum Before Birth
Collect colostrum into small 3 to 5 mL syringes. Between expression sessions on the same day, cap the syringe and store it in the refrigerator so you can add to the same syringe if you express again later that day. At the end of the day, place each syringe in a clean plastic freezer bag and move it to the freezer. Frozen colostrum keeps for four to six months.
When it’s time to head to the hospital or birth center, pack your frozen syringes in a small cooler surrounded by ice packs. Let your birth team know you have a colostrum stash so it can be stored properly on arrival. Having even a few syringes on hand can be especially valuable if your baby has low blood sugar, is premature, or has trouble latching in the first hours after birth.
Other Ways to Prepare During Pregnancy
Beyond colostrum collection, a few practical steps during the third trimester can set you up for a stronger milk supply once your baby is born. Staying well hydrated and eating enough calories matters because your body is building the breast tissue that will do the heavy lifting postpartum. There’s no magic food or supplement proven to boost supply during pregnancy, but consistent, adequate nutrition supports the process.
Familiarizing yourself with proper latch technique before birth is arguably more impactful than any physical preparation. The single biggest driver of milk supply after delivery is frequent, effective removal of milk from the breast, which starts with a good latch. Taking a breastfeeding class, watching videos from a certified lactation consultant, or scheduling a prenatal consultation with one can give you a significant head start. Many supply problems that surface in the first week trace back to latch issues that are fixable with the right guidance early on.
If you have a history of breast surgery, hormonal conditions like polycystic ovary syndrome or thyroid disorders, or noticed no breast changes at all during pregnancy, it’s worth mentioning these to your provider before delivery. These factors can affect milk production, and knowing about them in advance lets your care team plan support rather than scramble after the fact.