Underdeveloped girls

Do you feel like the smallest person in your class? Guys and girls who are shorter may feel out of sync with their peers — just as guys who mature earlier may feel strange if they shave first, or girls who get their periods before their friends may feel awkward. In most cases, teens who are small are probably just physically maturing a little bit more slowly than their friends. Or maybe their parents are smaller and they take after them.

Shape-shifting bodies. Cracking voices. Hairs sprouting in new places. Puberty marks a dramatic period of change for young people.

The London Clinic provides a full breast care service for women who are worried about their breast health or who have developed breast cancer. View our Breast services. The London Clinic is fully committed to compliance with Data Protection and medical confidentiality guidelines. Please see our Privacy Notice for further details on how we use your personal data. Breast development starts in an unborn baby and is completed during puberty and pregnancy.

Delayed puberty in girls occurs when breasts don't develop by age 13 or menstrual periods do not begin by age Puberty changes occur when the body starts making sex hormones. These changes normally begin to appear in girls between ages 8 to 14 years old. With delayed puberty, these changes either don't occur, or if they do, they don't progress normally.