Breasts that are not swollen and become soft at 40 days of pregnancy are generally normal.
After pregnancy, estrogen and progesterone will increase significantly, while estrogen can make the development of mammary ducts, progesterone will make the development of mammary gland follicles, the two together to promote the development of breasts, in order to prepare for breastfeeding after delivery. Due to the effect of hormones, the breasts will be swollen and tender, while some people have less obvious symptoms due to physical problems, but they are normal.
After pregnancy, breasts will not only have swelling, pain and softening, but also darkening, i.e. areola and nipple darkening, which are normal physiological changes and do not need to worry too much. However, if you feel particularly uncomfortable, you should consult a doctor in time.