Initial cycles can be very irregular. This is a problem seen in young girls, so once they start their cycles, it comes once in 2 or 3 months or even 4 to 5 months. Do not worry in the first 2 to 3 years. It is very natural for the body to go slowly into the rhythm of having periods. If the same pattern persists for more than 2 years, then you can get in touch with your doctor. Only thing you should be worried about is if the cycle does not stop on time. You should not let your daughter bleed for more than 5 to 7 days. If the flow continues, please visit the doctor.Another cause of confusion is the regularity of the cycles. If its 28 days, then fine, it its 2 or 3 days here and there, they come running. to the doctor. The normal cycle is defined from 21 to 35 days. Within this time frame is always fine, sometimes you have prolonged cycles. Maybe you are getting once in 45 days. but for your body its normal. Once in 45 days is OK. This is OK as the ovulation can vary from the 14th day to the 12th day or the 18th day. So, the cycle can also vary.