Medical Treatments
A test such as a CT scan or MRI will help to determine if a more serious problem such as a tumor in the pituitary gland, hypothalamus, brain, ovary, or testicle is causing the early onset of puberty. 

Once these possibilities are ruled out, hormone therapy with the intention of halting or even reversing sexual development is the most common treatment.  The goal would be to stop the rapid growth and bone maturation that will eventually result in stunted growth.

Once the therapy has begun, results are usually seen within a year.  The physical symptoms of precocious puberty may either cease or actually begin to reverse.  The treatment will also help a child’s behavior become more age-appropriate as the confusing hormonal messages going through their bodies cease.  Hormone therapy of this sort is safe for kids.

What a Parent or Older Sibling Can Do
When children go through puberty before they (or their peers) are mentally ready to understand those changes, the transformation can be extremely difficult and embarrassing.  They will not only feel awkward and confused emotionally but may be teased by other kids.  The hormonal changes that are happening will cause them to experience feelings typically associated with adulthood though they are not able to handle it. 

Let your parent know that the best thing they can do during this tough time is to be honest. Tell their child that he or she is experiencing changes that normally happen when someone is older.  Help her to understand that what she is going through is something that everyone will eventually go through but that her body just got a little ahead of itself. Talk about the treatment and what can be expected so that there will be no surprises.   

If you recognize some warning signs that your younger sibling is having a hard time emotionally (problems at school, lack of interest in friends or activities or depression…etc.), either because of teasing or just self-consciousness have your parents seek the advice of a doctor. It may become necessary to have a child psychologist talk with him or her to help work through the problems. 

The goal of you and your parents should be to keep the child from losing their self-esteem and self-confidence by concentrating on the other amazing qualities of the child.