Assertion: amenorrhea's period | /r/HasProperty | irregular
Facets:
value: during early adolescence
type: TEMPORAL
Source sentences:
text: Other types of medications can cause periods to stop or be irregular, including some forms of:
text: Although it is not uncommon for a girl's menstrual periods to be irregular during early adolescence , most girls' periods usually become regular within 18 months after the first one.