Is it normal to have Irregular periods during Puberty?

"Having irregular Cycles in the first 3 years after puberty is very very common. Why? This is because of the immaturity of the HPA axis. That means the brain releases certain hormones that will affect the ovary and then the ovary releases some hormones and then that will have an effect on the uterus and will cause menstruation. So when this axis from the brain to the ovary to the uterus will be immature in the initial years like in the first 3 years. So irregularity in the hormone release will be there. So irregularity in the cycle will be there. So you don't have to worry in the first 3 years post-puberty you only have to worry in this also when you have uncontrolled heavy bleeding. When the girl is losing lots of blood and becoming anemic it's affecting her general health. Then yes you should be worried about it. Otherwise, if you're getting cycles once in 3 months or once in 2 months and you have scanty flow then don't worry you just wait till the end of 3 years. Your cycles become regular as by themselves we can only reassure but yes if you are having very heavy flow you're losing a lot of blood. That's when is a point of concern"