Grown is a past participle for a word "Grow."
Grow- 1. (Of a living thing) undergo natural development by increasing in size and changing physically.
2. (Of a plant) germinate and develop.
3. Come into existence and develop.
4. Become larger or greater over a period of time; increase.
5. Become gradually or increasingly.
6. Allow or cause (a part of the body) to grow or develop.
Poonam has grown into a beautiful girl.