Puberty is a series of changes that your body goes through as you grow. Your body starts to produce hormones which will change your body and can also affect your emotions. Getting used to all the changes can sometimes be stressful. For girls, puberty usually happens between the ages of 8 and 14. Some girls can start puberty earlier and some later. Everyone is different. For some girls going through puberty can take a couple of years. For other girls it will take longer and be more like 4 years. This is normal and doesn’t mean there’s anything wrong with you.