The Truth About Colostrum Harvesting During Pregnancy

In this episode, we sit down with Lactation Consultant Samantha Crompton (SACLC / IBCLC) to unpack a massive trend dominating the modern prenatal space: antenatal colostrum harvesting—known clinically as antenatal colostrum expressing.

While TikTok, Instagram, and “momfluencers” push specialized consumer kits and intensive prenatal expressing as essentials for “prepared” motherhood, Samantha helps us look at what the science actually says. We dive deep into the clinical evidence, look at the hidden risks of indiscriminate prenatal expressing, and discuss how to separate evidence-based practice from consumer-driven anxiety.

Key Takeaways From This Episode

  1. What the Science Actually Says

We break down the clinical literature surrounding hand expression in the final weeks of pregnancy (usually starting around 36 weeks):

  • The DAME Study (2017): Confirmed there is no harm or adverse outcomes in advising low-risk pregnant individuals with diabetes to express breastmilk prenatally.
  • The Express MOM Pilot Study: Showed that antenatal expression does not induce labor in healthy, first-time mothers, finding no difference in gestational age at birth or overall long-term breastfeeding outcomes.
  1. When Does Prenatal Expressing Make Clinical Sense?

Antenatal colostrum harvesting is a highly valuable tool for selected, high-risk cases, including:

  • Mothers with Diabetes: Infants face a higher risk of hypoglycemia, and parents can experience delayed mature milk production (Lactogenesis II). Stored colostrum bridges the gap beautifully without relying on early formula top-ups.
  • Expected Separation: Situations involving maternal illness, congenital abnormalities, or planned NICU admissions where direct, immediate breastfeeding won’t be possible.
  1. The Hidden Downsides of the Trend

When applied indiscriminately to low-risk, healthy pregnancies, intensive prenatal expressing can inadvertently undermine a feeding journey:

  • The Biological Gold Standard: Colostrum is most potent when fresh. Freezing and thawing can diminish live cellular, microbial, and immune factors, missing out on the optimal maternal-infant microbial exchange that happens directly at the breast.
  • The “Ml” Worth Trap & Bruising: It is incredibly easy for parents to start measuring their parental worth by milliliters. This can lead to obsessive expressing (4–8 times a day), causing breast tissue inflammation and bruising.
  • The Illusion of Low Supply: Colostrum is hormonally locked in before birth and notoriously difficult to remove via hand expression. Expectant parents often get disheartened and depressed by low yields, triggering a “low supply mindset” before the baby is even born.
  • Postpartum Distraction: Relying on frozen syringes on night one can disrupt the natural, close observation needed to establish a good physical latch, and can sometimes leave infants less interested in feeding at the breast.

The Bottom Line

Antenatal colostrum harvesting remains a promising tool for selected, high-risk cases, but its indiscriminate application risks turning a natural process into an anxious, consumer-driven model. Self-reported insufficient milk is a public health crisis heavily fueled by social media. If early supplementation is clinically necessary after birth, tools like a Supplemental Nursing System (SNS) or short-term formula under the care of an LC can support long-term breastfeeding success without the prenatal stress.

Links & Resources Mentioned