Movie from the 80s-90's about a girl who becomes a boy?

I rented this once a really long time ago but have no idea what it was called. Basically this girl (tomboyish) buys this potion and her wish is to become a boy....and she does. There's a part in the movie where her parents take her to the doctor for a physical and its confirmed she's a boy. Its really weird but... show more I rented this once a really long time ago but have no idea what it was called. Basically this girl (tomboyish) buys this potion and her wish is to become a boy....and she does. There's a part in the movie where her parents take her to the doctor for a physical and its confirmed she's a boy. Its really weird but want to know the name of it!!!
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