Most guidelines recommend starting hand expression of colostrum at 37 weeks of pregnancy, once the baby is considered full term. Starting at this point minimizes any theoretical risk of triggering early labor while giving you several weeks to collect and freeze small amounts of colostrum before your due date.
Why 37 Weeks Is the Standard Starting Point
Nipple stimulation causes your body to release oxytocin, the same hormone that drives uterine contractions during labor. This has raised longstanding concerns about whether expressing milk before birth could trigger premature contractions. At 37 weeks, pregnancy is classified as early term, meaning the baby is developed enough that even if labor did begin, the risk to the infant is very low.
Some clinical protocols recommend starting as early as 36 weeks, particularly for people with diabetes or other conditions that put the baby at higher risk for low blood sugar after birth. Your midwife or OB may adjust the timing based on your specific situation. If you have a history of preterm labor, cervical insufficiency, or are carrying multiples, your provider will likely advise waiting or skipping antenatal expression entirely.
Who Benefits Most From Early Collection
Any pregnant person can practice antenatal expression, but it’s especially valuable if your baby is at higher risk of needing supplemental feeding in the first days of life. Babies born to mothers with gestational or pre-existing diabetes are particularly prone to low blood sugar (hypoglycemia) after birth. Having a stash of frozen colostrum means the baby can receive your milk instead of formula or intravenous glucose if blood sugar drops. This can also help avoid separation if the baby would otherwise need to go to a special care nursery for IV fluids.
Colostrum collected before birth is also useful if your baby is expected to have difficulty latching, such as with a cleft lip or palate, or if you’re planning a scheduled cesarean and want colostrum available immediately. Avoiding early formula exposure may support exclusive breastfeeding and, for babies of diabetic mothers, could reduce the likelihood of developing certain immune-related conditions later in life.
How Much Colostrum to Expect
If you’re imagining bottles of milk, reset your expectations. Colostrum is produced in very small quantities, and that’s completely normal. A newborn’s stomach on day one holds roughly 5 milliliters per feed, about one teaspoon. By day three, that increases to around 25 milliliters per feed.
During antenatal expression, you may collect only a few drops per session at first. Some people never get more than a milliliter or two before birth, and that’s still worthwhile. Colostrum is extraordinarily nutrient-dense. Even a small syringe of it can stabilize a newborn’s blood sugar or provide immune protection in those critical first hours. Don’t measure success by volume. If drops appear, you’re doing it right.
How Often and How Long to Express
Recommendations vary, but a reasonable starting routine is once or twice a day for about five to ten minutes total. Some protocols suggest up to three short sessions daily. The key is keeping each session brief and gentle, not marathon pumping sessions.
One widely used approach is to express twice daily for about ten minutes until you go into labor or are admitted to the hospital. Another common recommendation is once daily for five minutes. Start with whatever feels manageable and build from there. Many people find that expressing during or right after a warm shower helps with letdown, since the warmth and relaxation can make colostrum easier to release.
How to Collect and Store It
You don’t need a breast pump for this. Hand expression works better for colostrum because the volumes are so small that a pump can’t effectively capture them. Here’s what you need:
- 1 mL needleless syringes: These are the primary collection tool. You express drops into a small medicine cup or directly onto a clean spoon, then draw them up into the syringe.
- Small medicine cups: Useful as a collection vessel during expression.
- Ziplock bags and labels: For organizing syringes in the freezer with the date written on each one.
Needleless syringes and medicine cups are available at most medical supply stores or pharmacies. Some hospitals and birth centers provide antenatal expression kits if you ask.
For storage, follow the same guidelines used for expressed breast milk. Freshly expressed colostrum is safe at room temperature (77°F or below) for up to four hours. In the refrigerator, it lasts up to four days. For longer storage, freeze it at 0°F or colder. Frozen colostrum is best used within six months, though it remains acceptable for up to 12 months. When you head to the hospital, pack your labeled syringes in a cooler bag with ice packs.
The Hand Expression Technique
Wash your hands thoroughly before starting. Place your thumb and forefinger about an inch behind the nipple, roughly at the edge of the areola. Press gently back toward the chest wall, then compress your fingers together in a rhythmic rolling motion. You’re not squeezing the nipple itself, but the tissue behind it where the milk ducts sit.
The first few times, you may see nothing or just a single bead of thick, yellowish fluid. That’s colostrum. Use the syringe to draw it up. Rotate your finger position around the areola to access different ducts. If nothing comes out after a few minutes, stop and try again later. It often takes several sessions before the technique clicks and colostrum flows more readily.
What to Watch For
If you notice regular, painful contractions during or after expression, stop the session. Occasional tightening (Braxton Hicks contractions) is common in late pregnancy and not a cause for concern, but persistent or intensifying contractions that don’t ease when you stop should be reported to your provider.
Some people feel discouraged if they can’t express any visible colostrum before birth. This doesn’t predict your milk supply after delivery. Colostrum production ramps up significantly once the placenta is delivered and hormones shift. The inability to express prenatally says nothing about your body’s ability to feed your baby. Many people who collect nothing before birth go on to breastfeed without any issues.