Colostrum is the thick, yellowish milk your breasts produce in the first few days after birth, and it serves as your newborn’s first food, immune booster, and digestive aid all in one. You can express it before birth to have a supply ready, feed it directly at the breast, store it for later, or even use it topically on your baby’s skin. Here’s how to make the most of it.
Why Colostrum Matters So Much
Colostrum is dramatically more concentrated in immune factors than the mature milk that follows. It contains about 5 mg/ml of secretory IgA, the antibody that coats your baby’s intestinal lining and prevents microorganisms from crossing into tissue. That concentration drops to roughly 1 mg/ml once mature milk comes in. Colostrum also packs 5 to 7 grams per liter of lactoferrin, a protein that binds iron in your baby’s digestive tract. Harmful bacteria need iron to multiply, so lactoferrin essentially starves them out. Together, these two components protect the lining of both the digestive and respiratory tracts during the most vulnerable window of your baby’s life.
Colostrum also acts as a mild laxative. It helps your baby pass meconium, the dark, sticky first stool, more quickly. Clearing meconium matters because it contains bilirubin, the substance responsible for newborn jaundice. The faster meconium moves through, the lower the risk of bilirubin building up to problematic levels.
Expressing Colostrum Before Birth
You can start hand expressing colostrum from around 36 weeks of pregnancy. Antenatal expressing gives you a small stash to bring to the hospital, which is especially useful if your baby is expected to need extra support, such as babies with a cleft lip, a heart condition, or those whose mothers have gestational diabetes. Having colostrum on hand means your baby gets the immune benefits immediately, even if breastfeeding takes time to establish.
Because colostrum is thick and produced in tiny amounts, hand expression works far better than a breast pump. You’ll likely get just a few drops per session in the beginning. Collect those drops directly into a small syringe or onto a clean teaspoon. You can store colostrum right in the syringes you collect it in, labeled with the date, and freeze them. Expressing sometimes triggers mild contractions. If that happens consistently, stop and let your midwife know.
How Much to Expect
The volumes are small, and that’s completely normal. On day one, total production over 24 hours ranges from essentially nothing to about 123 ml, with each individual feed delivering just a few drops to around 5 ml (roughly one teaspoon). By day two, total daily output climbs to somewhere between 44 ml and 335 ml, with each feed providing 5 to 15 ml. Your baby’s stomach is tiny at birth, so these small amounts are a perfect match.
Around 2 to 5 days after delivery, you’ll notice your breasts feeling fuller and warmer as transitional milk begins replacing colostrum. The color shifts gradually from golden yellow to a bluish white. By about 10 to 15 days postpartum, you’re producing mature milk. The colostrum phase is brief, which is one reason every drop counts.
Feeding Colostrum to Your Baby
The simplest approach is feeding at the breast. Frequent nursing in the first hours and days stimulates production and helps your baby practice latching while volumes are still low. If your baby can’t latch or is in the NICU, you have several options for getting expressed colostrum into them:
- Syringe feeding: Draw colostrum into a small oral syringe and slowly release drops into the side of your baby’s mouth. This gives you precise control over tiny volumes.
- Spoon or cup feeding: Tip a small amount from a spoon or medicine cup into your baby’s mouth. This avoids any nipple confusion concerns.
- Finger feeding: Attach a syringe to a thin tube taped alongside your finger, allowing your baby to suck from the tube while your finger rests on their palate.
All of these methods work well specifically because colostrum comes in such small quantities. A standard bottle isn’t practical when you’re working with a teaspoon of liquid.
Storing Colostrum Safely
CDC guidelines for breast milk storage apply to colostrum as well. Freshly expressed colostrum keeps at room temperature (77°F or below) for up to 4 hours. In the refrigerator at 40°F, it stays good for up to 4 days. In the freezer at 0°F or colder, it’s best used within 6 months, though it remains acceptable for up to 12 months.
If you expressed colostrum before birth, freeze it in the syringes you collected it in, each one labeled with the date. Transport frozen syringes to the hospital in a cooler bag with ice packs. To thaw, let frozen colostrum come to room temperature (around 70°F to 75°F) or hold the syringe under lukewarm running water. Never microwave colostrum. Microwaving creates hot spots that can burn your baby’s mouth and damages the antibodies and proteins that make colostrum so valuable. Gentle warming to body temperature preserves those bioactive components. Once thawed, use it within 2 hours at room temperature or refrigerate and use within 24 hours.
Topical Uses for Colostrum
Colostrum isn’t only for feeding. Its immune and healing properties make it useful applied directly to skin. Rubbing a few drops onto cracked or sore nipples after breastfeeding sessions is a long-standing practice supported by public health nurses who have observed its effectiveness on chapped skin and soft tissue irritation.
For babies, colostrum has been studied as a treatment for diaper rash. In a controlled trial of infants with diaper dermatitis, those whose mothers applied breast milk to the affected area three times daily saw 80% improvement within five days, compared to just 26% improvement in the group that received no topical treatment. There are also reports of colostrum being used on infant eczema, minor skin irritation, and even mild eye discharge (conjunctivitis), though the evidence for those uses is more anecdotal. If you have extra colostrum or a few leftover drops after a feed, dabbing them on irritated skin is a reasonable, low-risk option.
Practical Tips for Getting the Most Out of It
Hand express in a warm room or after a warm shower, since heat helps with let-down. Gentle breast massage before and during expression can increase the amount you collect. If you’re expressing before birth, try two to three short sessions per day rather than one long one. Keep clean syringes and a teaspoon nearby so you can capture every drop without scrambling.
Once your baby arrives, aim for at least 8 to 12 feeds in every 24 hours during the colostrum phase. Frequent feeding does double duty: it gives your baby the immune protection of colostrum and it signals your body to ramp up production as you transition to mature milk. If your baby is sleepy and not waking to feed, hand express and offer colostrum by syringe or spoon to keep intake and stimulation on track.
Even small amounts of colostrum carry outsized benefits. A single teaspoon delivers millions of antibodies and immune cells. The goal isn’t volume. It’s consistency: getting whatever you can produce into your baby as early and as often as possible during those first few days.