International Board of Certified Lactation Consultant (IBCLC) Practice Exam

When can breastmilk be considered mature milk after a normal onset and progression of lactation?

1. 3 days

2. 5 days

3. 7 days

4. 10 days

The correct answer is: 7 days

Breastmilk is classified as mature milk typically around 7 days postpartum. This timeframe is significant because during the initial days following childbirth, a woman produces colostrum, which is a nutrient-rich fluid with immunological benefits for the newborn. Colostrum gradually transitions into transitional milk, which occurs between about 2 to 6 days postpartum, as the milk supply and composition adjust to the demands of the growing infant. By around 7 days, the milk has undergone enough change to be recognized as mature milk. Mature milk is characterized by its balance of nutrients, including fats, proteins, and lactose, essential for the infant's growth and development. The composition becomes more stable, and the volume of milk typically increases, aligning better with the baby's feeding needs. This understanding of the timeline helps guide lactation consultants and healthcare providers in supporting new mothers during their breastfeeding journey, ensuring they understand the normal progression of lactation and the importance of early feeding practices.