 [ Symptoms ] hi i just turned 12 and my penis is 4 6 inches long is this normal and why does it grow so quick [ Disease ] it is probably time to say welcome to puberty  it sounds like everything is normal to me when you enter puberty a cascade of hormones begins flooding through your body these hormones cause you to develop body hair and they also will cause your penis to become larger the testicles also increase in size and yes sometimes these things happen with startling quickness that seems to be the case with you please do not get into a habit of measuring your penis every guy on the planet gets worried about his penis size is it too small let me tell you there is a wide range of normal penis sizes yours sounds within the normal range and it is probably not done developing yet another thing eventually years from now you will be ready to use that penis to have sex please remember to always practice safe sex use a condom even if the girl you are with tells you she is on birth control condoms protect you and your partner from a wide variety of sexually transmitted diseases at 12 years old you are nowhere near ready for sex but a little information now may help you later right if you can not talk to your parents about puberty sex and all the physical and emotional changes you are going through try to find a trusted adult maybe a friend is dad athletic coach pastor or school counselor to confide in it is good to talk to someone who can tell you everything is going to be ok  wishing you well hi you have a gift look after it as you get older women will just love you its ok you can put yourself above normal do not worry your ok good luck ps just look after it wash it daily and do not forget behind your foreskin its very important that you keep your penis healthy do not over masturbate if you masturbate use a featherlight touch just remember your penis is affected by every aspect of your physical mental and emotional life keep a copy of this last bit it will stand you well do hope this bit helps you you are in the midst of puberty so your body will go through some pretty drastic changes but do not worry these are all normal and the average penis size is 6 inches erect so you are well on your way but down the road a bit you might want to consider using a penis health creme every morning these help men keep their penis skin healthy clean smooth and irritation free this is a big part of sex and intimacy it is not just about size i use a creme called man1 man oil and it works great keep it in mind good luck to you