Can a 12 year old girl have double d's?

Yes, a 12-year-old girl can have double D cup breasts, as breast development varies significantly during puberty. Factors such as genetics, nutrition, and hormonal levels play a role in breast size. However, it's important to remember that everyone develops at their own pace, and breast size does not determine a person's health or worth. If there are concerns about development, it's best to consult a healthcare professional.