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Changes
→It's normal
: Once the breasts have grown one is often bigger than the other.
: Your first period may be unexpected so you may want to keep a sanitary towel just in case.
: You should have your first period between 10 and 15 years old. If it happens a bit earlier that's not a problem. If it doesn't happen by 16 you should speak to a doctor.
: At first your period might not happen every month.
: Your period should not last more than 7 days. If it lasts longer, then you should talk to a doctor.