Irregular Periods After Childbirth: Causes & When to Worry

Question
Hello,
I had my first child this past Jan '09. Before I was pregnant my cycles were very irregular, between 35-100+ days. I only ovulated 5x a year.
After I had my baby my cycle returned when my daughter was 5 months old. It again, has been irregular but now it when I do get it it lasts 10-14 days (before it lasted 6-7 days).
During this time the flow is medium-heavy pretty much start to finish.
Should I be concerned?
Why is my menstrual flow so long?

Thank you!

Answer
I can't answer why it is long.... it could be a thyroid hormone problem, could be a female hormone problem, endometriosis, etc.  I would go on birth control pills for 3-6 months and see if you can regulate it then stop them...... that often helps.  Also, get the thyroid levels checked..... I hope this helps