Acne
Puberty
Be in a mood for something
Voice breaking
Period
Be in no mood for something
to want to do or have something
for a while, a boy might find his voice goes very deep one minute and very high the next
the bleeding from a woman's womb that happens once a month when she is not pregnant
to not want to do something, often because you are angry
a skin condition that shows up as different types of spots
the time when children's bodies change and become like adults' bodies