What if a girl never gets her period? Lots of girls worry that it will never happen for them, but it almost always does. A girl's first period usually arrives about 2 years after she starts developing breasts. See the doctor if you are 14 and have seen no breast development or other signs of puberty. A girl also should see the doctor if she's 16 and has had some body changes, but still hasn't had her first period. See more Personal Questions Back to Articles Related Articles Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor. © 1995-2021 KidsHealth®. All rights reserved. Images provided by The Nemours Foundation, iStock, Getty Images, Veer, Shutterstock, and Clipart.com.