Hi @Apopa,
Thanks for your question. Penis growth happens during puberty. But the changes happen slowly and over a period of time. It’s not a single event and each male is different. The first puberty change is the enlargement of the testicles and scrotum. Penis enlargement begins about one year after the testicles start enlarging. The penis will continue to enlarge in both size and length as you move through puberty. Sleeping on your stomach does not affect growth. And there are no specific tips or tricks to speed the process. Your body will go through many changes through the teenage years. Hair growth, wet dreams, changes in voice, and acne. Growth happens over many years and there’s no need to rush 🙂