The timing of a girl’s second period after her initial period is uncertain and is related to a variety of factors, such as age and body type. Because menstruation is unstable, some girls may have their second period every other month, but some girls may not have their period again until two months later, or even a year later. The first six months of menstruation are basically not very regular because the gonadal axis is not yet well developed, the ovaries are not functioning perfectly and the level of secreted hormones is generally unstable, which leads to irregular menstrual cycles. The first time a girl gets her period don’t be overly frightened, but correctly understand that this is a normal physiological process. In addition, after the first menstruation of girls, basically have the ability to reproduce, it is recommended that the younger age as far as possible not to have sex, but if you have sex, you need to pay attention to contraception.