Within a year after menarche, most girls' ovaries will begin releasing mature, fertilizable eggs called ova.

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After menarche, which is the first menstrual cycle, or first menstrual bleeding, in female humans, the ovaries gradually begin to release mature ova over the following months, making fertilization possible. This process may not be regular at first, leading to irregular menstrual cycles, but it indicates the start of reproductive capability.

Within a Year After Menarche, Most Girls' Ovaries Will Begin