It is normal for breasts to remain undeveloped at 9 weeks of pregnancy. After pregnancy, the hormone level of the body changes, some pregnant women will be around 8 weeks of pregnancy breast changes, may feel the breast swelling, pain. However, due to individual differences, not all women’s breasts will develop at 9 weeks of pregnancy, so it is normal for breasts to remain undeveloped at 9 weeks of pregnancy and there is no need to be overly nervous. It is recommended to take regular pregnancy checkups during pregnancy to observe the growth and development of the fetus. Pay attention to breast hygiene, you can use warm water to wipe, avoid squeezing and rubbing. You should also pay more attention to your diet, supplement your intake of nutrients, and ensure that your diet is diversified, avoiding a single diet, which may affect the growth and development of the fetus.