A growth fetish is when someone is sexually attracted to people who are growing. This might include watching someone getting taller, or seeing a person gain weight. It is similar to other fetishes that involve body changes, like muscle fetishes or stretch marks. The person with the fetish might enjoy watching people go through growth spurts, or transitioning from one body type to another. It can also involve fantasizing about being with someone who is experiencing a growth spurt in real time.