My daughter had her first period in June and a second one in July. Since then she has not had any more periods. I have read where teens can miss some periods the first year or two of menarche. However, I have not been able to find out how many consecutive missed periods would be considered normal. I would appreciate if anyone could refer me to any website that might be helpful in answering this question.

Just as each one of us women is different, so are our daughters, and so are their periods.

Irregular periods are common in girls who are just beginning to menstruate. It may take the body a while to sort out all the changes going on, so a girl may have a 28-day cycle for 2 months, then miss a month, for example. Usually, after a year or two, the menstrual cycle will become more regular. Some women continue to have irregular periods into adulthood, though.

Most of the time, irregular periods are part of the normal changes that can happen when you're a teen. At some point as you grow, your cycle will probably settle into a recognizable pattern. This usually happens by 3 years after your first period.

However, some teens may develop irregular periods — or stop having periods altogether — as a result of certain medications, excessive exercise, very low body weight, or not eating enough calories.

KidsHealth - the Web's most visited site about children's health (http://www.kidshealth.org) is a great website with a lot of info.