Timeline of Breast Changes in Pregnancy

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Whether or not you plan to breastfeed, your breasts will prepare themselves for nourishing your baby. The female breast, also referred to as the mammary gland, takes its name from the Latin word for breast – ‘mamma’. Throughout pregnancy your breasts will undergo subtle, and not so subtle, transformations. This timeline charts your breasts’ remarkable journey.

Note: This timeline uses the medical format for calculating pregnancy weeks. So for instance, you technically ovulate near what would be called week two of pregnancy, and your due date is week 40. Notice how breast changes to prepare for breastfeeding occur as early as pre-ovulation!

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Week 1:

  • During each menstrual cycle, maturation and the rapid growth of milk ducts and alveolar buds take place during the follicular and ovulatory phases.

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