Simplify the following text for a Grade 7 native English-speaking person.
Original: Dwarfism is short stature resulting from a particular medical condition . It is sometimes defined as an adult height of less than 4 feet 10 inches ( 147 cm ) , although this definition is problematic because short stature in itself is not a disorder .
Simplified: Dwarfism is used to describe a person of short stature , less than 4 feet 10 inches ( 147 cm ) .