Collecting colostrum during pregnancy, often called “colostrum harvesting,” involves hand expressing small amounts of this early milk into syringes and storing them for your baby’s first feeds. Most people begin at 36 to 37 weeks of pregnancy, starting with just a few minutes once a day and gradually building up. The process is simple, requires minimal supplies, and can give you a useful reserve of colostrum ready for your baby at birth.
Why People Collect Colostrum Before Birth
Antenatal colostrum expression was originally introduced to provide an immediate supply of colostrum for newborns at higher risk of low blood sugar, particularly babies born to mothers with gestational diabetes. Having frozen syringes of colostrum on hand means your baby can receive your milk right away, even if breastfeeding takes time to establish. It also reduces the need for formula supplementation in those early hours.
Beyond medical reasons, many parents collect colostrum simply for peace of mind. If your baby is sleepy, premature, or has difficulty latching, having a small stash means you’re not starting from zero. Some people also find that practicing hand expression before birth builds confidence and familiarity with the technique they’ll use frequently in the first days postpartum.
When to Start
The standard recommendation is to begin at 36 to 37 weeks of pregnancy. At this point, your body is already producing colostrum (it starts during the second trimester), and your pregnancy is far enough along that the mild hormonal effects of nipple stimulation pose very little concern. Starting earlier than 36 weeks is not recommended without specific guidance from your midwife or doctor, because nipple stimulation triggers a small, temporary release of oxytocin, the same hormone used to induce labor.
That said, the actual risk appears to be low. Research shows that oxytocin levels rise within about a minute of breast stimulation and return to baseline within six minutes after stopping. A Cochrane review looking at nipple stimulation and labor onset found that the effect was not significant in women whose cervix was not already favorable for labor. Still, starting at 36 weeks provides a reasonable safety margin.
Who Should Avoid It
Certain pregnancy complications make antenatal expression inadvisable. These include:
- Placenta previa (placenta covering the cervix)
- Pre-eclampsia
- Preterm premature rupture of membranes (waters breaking early)
- Intrauterine growth restriction or known fetal concerns
- A history of preterm labor or cervical procedures like a cone biopsy
If you have gestational diabetes, your situation is a bit nuanced. Diabetes is actually one of the main reasons colostrum collection is encouraged, because these babies are more likely to need supplemental feeds. But because gestational diabetes can also carry other complications, your care team should confirm that expression is appropriate for your specific pregnancy.
What You Need
You don’t need much. The core supplies are small sterile syringes, caps to seal them, and a way to label and freeze them. Most colostrum collection kits include 1 ml, 2.5 ml, and 5 ml syringes, since the volumes you’ll collect are tiny, sometimes just drops at first. You’ll also want a small collection container (a clean spoon or medicine cup works fine) to catch the drops before drawing them into a syringe.
Some hospitals and birth centers provide colostrum collection kits for free. If yours doesn’t, you can buy pre-made kits online or assemble your own with sterile oral syringes from a pharmacy. Syringe caps, waterproof labels, and small freezer bags round out what you need. Label each syringe with the date it was expressed.
The Hand Expression Technique
Colostrum is too thick and produced in too small a quantity for a breast pump to work well. Hand expression is the standard method, and it’s straightforward once you’ve practiced a few times.
Start by washing your hands. Apply a warm cloth to your breast for a minute or two, or try expressing after a warm shower. Warmth helps the colostrum flow more easily. Then follow these steps:
- Form a C shape. Place your thumb above the nipple and your fingers below it, about 1 to 2 inches back from the nipple itself.
- Press back. Push your fingers and thumb straight back toward your chest wall.
- Compress. Gently squeeze your thumb and fingers together, moving them toward each other (not sliding on the skin).
- Release and repeat. Use a rhythmic pattern: press, compress, release. Continue until drops stop forming, then switch to the other breast.
Rotate your hand position around the nipple periodically to reach different milk ducts. The key rule: it should not hurt. If it does, you’re likely squeezing too hard or too close to the nipple. You’re aiming for gentle, rhythmic pressure, not forceful squeezing.
In the first few sessions, you may get only a few drops, sometimes less than half a milliliter. This is completely normal. Colostrum is produced in very small quantities because a newborn’s stomach is only about the size of a marble. Even a fraction of a milliliter has value.
How Often and How Long
Start gently. In your first week of practice, express once a day for just a few minutes. As you get comfortable, you can gradually increase to 5 to 10 minutes per session, two to five times a day. There’s no need to push for maximum output. The goal is to collect what comes easily and to familiarize your body with the process.
Many people find that certain times of day yield more colostrum than others. Mornings tend to be slightly more productive for some, while others find a warm bath in the evening makes expression easier. Experiment and go with what works for you. If nothing comes out at first, that’s fine too. It doesn’t predict how your milk supply will be after birth.
Storing Your Colostrum
Once you’ve drawn colostrum into a syringe, cap it, label it with the date, and freeze it. Frozen colostrum keeps well for up to six months without damage to the antibodies and immune factors that make it so valuable for your baby.
If you plan to use the colostrum within a couple of days (for example, collecting on a Monday and giving birth on a Wednesday), refrigeration is fine for two to three days. For anything beyond that, the freezer is the safer choice. Store syringes in a sealed freezer bag to protect them.
You can add to the same syringe across multiple sessions in one day. Express into your collection container, draw it into the syringe, refrigerate between sessions, and freeze the syringe at the end of the day. Don’t add freshly expressed colostrum to an already-frozen syringe.
Bringing Colostrum to the Hospital
On the day you head to the hospital or birth center, pack your frozen syringes in a small insulated bag with an ice pack. Let your midwife or nurse know you have expressed colostrum so they can store it properly and use it when needed. Most maternity units are familiar with this practice and will have a way to keep it frozen or thaw it when the time comes.
To thaw a syringe, hold it under warm running water or place it in a cup of warm water for a few minutes. Don’t microwave it, as this destroys beneficial components and creates hot spots. Once thawed, use it within a couple of hours. You can feed it to your baby by slowly pushing the syringe contents into the corner of their mouth, which is how most maternity staff will administer it as well.