21 Weeks Pregnant: Understanding Breast Anatomy

Your Breasts and Their Marvelous Changes

By now, your breasts may be undergoing noticeable changes as they prepare for lactation. Understanding the anatomy of your breasts can help you feel more confident as you approach breastfeeding. Here’s a quick guide:

  • Nipple: The visible part through which milk flows, containing multiple tiny openings for milk delivery.
  • Areola: The darker area around the nipple, equipped with Montgomery glands that secrete an oily substance to protect and lubricate.
  • Mammary Glands: These are the powerhouse milk producers, with alveoli (tiny sacs) inside lobules working hard to make milk.
  • Milk Ducts: The transport system, carrying milk from the alveoli to your nipple for your baby to access.
  • Support Structures: Ligaments and connective tissue provide structural integrity and help maintain shape.

These features work in harmony to support lactation. If you’ve noticed changes in size, sensitivity, or pigmentation, it’s all part of your body’s preparation for feeding your baby.

Tips for You This Week
  • Gently massage your breasts during showers to improve circulation and get familiar with their structure.
  • Invest in a comfortable, well-fitting maternity bra to support growing tissue.
  • If you’re experiencing tenderness, applying warm compresses may offer relief.
Fun Fact:

Montgomery glands on the areola secrete a scent that helps guide your newborn to latch—another fascinating way your body is preparing for this journey.

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