Colostrum harvesting is one of the most practical things a pregnant woman can do to prepare for breastfeeding. Yet it’s still something many women don’t hear about until they’re already struggling after birth, if they hear about it at all.
Here’s a straight-talking guide to what it involves, who it’s most useful for, and how to do it safely.
What Is Colostrum?
Colostrum is the first milk your breasts produce, a thick, concentrated fluid that’s present from mid-pregnancy and is your baby’s primary food for the first few days after birth, before your mature milk comes in.
It’s produced in small amounts, typically just a few millilitres per feed in the early days , but those small amounts are exactly what a newborn’s stomach is sized for. Colostrum is packed with antibodies, immune factors, growth factors, and proteins that are specifically designed for a brand-new gut. It also has a mild laxative effect that helps your baby pass meconium (their first poos), which in turn helps reduce jaundice.
In short, colostrum is not a lesser version of breastmilk. It’s precisely calibrated for the first days of life.
What Is Colostrum Harvesting?
Colostrum harvesting means hand expressing small amounts of colostrum during the last weeks of pregnancy, collecting it in syringes, and freezing it so it’s available immediately after birth if needed.
The technique involves gentle breast massage and hand expression , a skill worth learning regardless, as hand expression is more effective than a pump in the first days after birth when milk volumes are small.
Who Should Consider It?
Colostrum harvesting is valuable for any woman who wants to be prepared, but it’s particularly recommended for women who have:
- A planned caesarean section (where milk coming in is sometimes delayed by 24–48 hours)
- Gestational diabetes (babies born to mothers with GDM may have low blood sugar at birth and need supplementation; having your own colostrum available means that supplementation can be with your milk, not formula)
- A previous low supply experience or concerns about supply
- Undergone breast surgery (augmentation, reduction, or biopsy), which may affect milk gland function
- PCOS or thyroid conditions associated with supply challenges
- A baby who may need NICU or special care support after birth
- A strong personal motivation to breastfeed and a desire to set themselves up as well as possible
When Can You Start?
The standard guidance is from 36 weeks of pregnancy. Before this point, nipple stimulation carries a theoretical risk of triggering uterine contractions, which is why earlier harvesting is generally not recommended in uncomplicated pregnancies.
If you have had a previous preterm birth, are carrying multiples, or have any cervical concerns, speak with your obstetrician or midwife before starting. Harvesting may still be appropriate, but with specific guidance.
How Do You Collect It?
Colostrum harvesting is done by hand, not with a pump. Breast pumps are not designed to extract the small volumes produced antenatally and are largely ineffective at this stage.
The process involves:
- Warming the breast gently (a warm facecloth or shower beforehand can help)
- Gently massaging the breast tissue toward the nipple
- Applying C-shaped hand pressure behind the areola, compress, hold, release, repeat
- Collecting any drops that emerge into a small sterile syringe (1ml syringes are ideal)
Sessions are typically 5–10 minutes per breast, once or twice a day. You will not produce much, especially at first; a few drops to half a millilitre is completely normal and does not indicate anything about your future supply. What you’re doing is learning the technique, which will serve you well in those first hours after birth.
Collected colostrum should be labelled with the date and frozen flat. Frozen colostrum is stable for up to three months in a standard freezer, or up to six months in a dedicated deep freeze.
How Can I Learn to Do It Properly?
This is where working with an IBCLC antenatally is genuinely useful. Hand expression is a skill; the technique matters, and most women find they produce significantly more once they’ve had hands-on guidance than when they’ve tried following a written guide.
I include colostrum harvesting guidance in my antenatal consultations, and I’ll show you exactly what you’re doing and how to adjust your technique.