During pregnancy, it is usual for the breasts to change in size and a woman may find her bra size alters several times before (and after) delivery. Towards the end of pregnancy, the breasts will start to feel full and heavy as they prepare for breastfeeding. They may start to leak a small amount of colostrum, which is the thick, nutrient-rich milk that is baby’s first food source.
Even early on in pregnancy, breasts may feel tender to the touch and the areolas will often darken and enlarge. Sensitive breasts and tiredness are some of the first signs that a woman is pregnant.