What Is Colostrum and Why Is It So Important for My Newborn?

Birthstone Midwifery

Breastfeeding · Newborn Care

What Is Colostrum and Why Is It
So Important for My Newborn?

By Tayna Chessman, LM, CPM  ·  Birthstone Midwifery

Before your milk comes in — before those full, heavy breasts and the abundant supply that follows — your body produces something even more remarkable. Colostrum is your baby's first food, and it is unlike anything else in nature.

What Is Colostrum?

Colostrum is the first form of breast milk produced during pregnancy and immediately after birth. It is thick, concentrated, and often golden or yellowish in color — which is why it is sometimes called liquid gold. Your body begins producing colostrum as early as 16 weeks of pregnancy, and it remains your baby's primary nutrition for the first two to five days after birth, until your transitional milk comes in.

Do not let the small volume fool you. Colostrum is produced in exactly the right amount for a newborn's tiny stomach — roughly the size of a marble on day one. Your baby does not need large volumes. They need the extraordinary composition that colostrum provides.

"Colostrum is not a precursor to real milk — it is real milk. The most perfectly engineered food your baby will ever receive."

What Makes Colostrum So Remarkable

Immune Protection

Colostrum is packed with secretory IgA antibodies that coat your baby's gut and respiratory tract, providing immune protection before their own immune system is mature.

Gut Sealing

Colostrum seals the permeable lining of your newborn's gut, preventing harmful bacteria and allergens from passing into the bloodstream in the early days of life.

Jaundice Prevention

Colostrum acts as a natural laxative, helping baby pass meconium quickly — which reduces the amount of bilirubin reabsorbed and lowers jaundice risk significantly.

Blood Sugar Stability

The natural sugars and composition of colostrum help stabilize your newborn's blood glucose levels in the critical hours immediately after birth.

Colostrum and the First Latch

The first feeding ideally happens during the golden hour — that first uninterrupted hour of skin-to-skin contact after birth. During this time, babies placed on the mother's chest will often root, find the breast, and latch on their own. This first feeding does not need to be perfect. Even a few minutes of suckling in that first hour sets important hormonal signals in motion for your milk supply.

At every birth I attend, supporting that first latch is one of my primary jobs in the immediate postpartum period. I will stay with you, help you find a comfortable position, and give you hands-on guidance until breastfeeding feels established.

What If Colostrum Seems Like Not Enough?

This is one of the most common concerns new parents have — and one of the most common reasons breastfeeding gets supplemented unnecessarily in those early days. Here is what you need to know:

• A newborn's stomach holds approximately 5–7ml on day one — a few teaspoons. Colostrum production matches this exactly
• Frequent feeding — 8–12 times in 24 hours — is normal and necessary to stimulate milk production
• Supplementing with formula in the early days can reduce the stimulation needed to bring in your full milk supply
• Signs that baby is getting enough colostrum include appropriate wet and dirty diapers, contentment after feeds, and normal weight loss patterns

Can You Harvest Colostrum Before Birth?

Yes — antenatal colostrum harvesting (collecting and storing colostrum during late pregnancy) is an option for some families. This is particularly helpful if there is a known reason a baby might need supplementation after birth. This is a conversation worth having with your midwife or lactation consultant during the third trimester.

Frequently Asked Questions About Colostrum

What is colostrum?

Colostrum is the first milk produced by the breasts, present from mid-pregnancy and continuing for the first few days after birth. It is thick, concentrated, and rich in antibodies, immune factors, and nutrients perfectly designed for a newborn's needs.

When does colostrum turn into regular breast milk?

Transitional milk — the bridge between colostrum and mature milk — typically comes in between days 3 and 5 after birth. The transition is gradual. Mature breast milk is usually established by 2 weeks postpartum.

What if I am not planning to breastfeed — does colostrum still matter?

Even if you plan to formula feed, giving your baby colostrum for just the first few days provides significant immune benefits. This is a personal decision — and there is no judgment either way at Birthstone Midwifery.

Is it normal for my milk to take several days to come in?

Yes. Colostrum is your milk for the first several days — and it is exactly what your baby needs. Full milk volume typically arrives between days 3 and 5, sometimes a little later for first-time mothers or after a cesarean birth.

Breastfeeding Support From a Midwife Who Stays

At Birthstone Midwifery, breastfeeding support does not end when I walk out the door after your birth. It continues through every postpartum visit. Book a virtual session for prenatal breastfeeding preparation, or ask about postpartum support.

Connect With Tayna →

Tayna Chessman, LM, CPM (#784) is a California Licensed Midwife and the founder of Birthstone Midwifery,
serving families in Temecula, Murrieta, Winchester, Menifee, Lake Elsinore, and throughout Riverside County, California.