Penis Size

How can I tell if my baby’s penis is the normal size for his age?

Penis Size

Dr. Greene’s Answer:

In determining size, the “stretched penile length” is far more important than the “relaxed length.” To evaluate penis size, stretch the penis gently and measure from the bone at the base all the way to the tip. Be sure to depress the surrounding fat pad to get all the way to the base. Here are the normal values:

Average Stretched Penile Length 
(Adapted from Feldman KW, Smith DW. Journal of Pediatrics. 1975; 86:395):

Age
Normal: Mean +/- 1 SD (inches)
Abnormal: Mean – 2.5 SD (inches)
0-5 months
1.5 +/- 0.3
0.75
6-12 months
1.7 +/- 0.3
0.9
1-2 years
1.9 +/- 0.3
1.0
2-3 years
2.0 +/- 0.4
1.1
3-4 years
2.2 +/- 0.4
1.3
4-5 years
2.2 +/- 0.4
1.4
5-8 years
2.4 +/- 0.4
1.5
8-11 years
2.5 +/- 0.4
1.5
Adult
5.2 +/- 0.6
3.7

 

Dr. Alan Greene

Dr. Greene is the founder of DrGreene.com (cited by the AMA as “the pioneer physician Web site”), a practicing pediatrician, father of four, & author of Raising Baby Green & Feeding Baby Green. He appears frequently in the media including such venues as the The New York Times, the TODAY Show, Good Morning America, & the Dr. Oz Show.

  1. Eric

    My son is 1 week old his penis is already 1 whole inch the doctor said is real big for his age what does this mean?

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  2. Ralph Jenson

    My penis is 2.5″ soft 4″ hard and I’m 10 years old
    Is that below average above average or normal

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  3. Matthew

    I am 12 years old going to turn 13 and my penis is very small like a 5 year olds pls help me

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  4. michelle ebejer

    I have a 6 month boy and his penis opening is still closed in his skin. There is a tiny hole and it’s not in the centre. Is this normal?

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  5. John

    I’m 12 my penis is 3 inches soft and about 4 inches hard is this normal, below average , or above average?

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  6. juan

    I am a 12 year old. I want to see if my size is normal. When I have a boner its 2 to 3 inches. Please tell me if it normal and to tell me how to make it bigger.

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  7. ss

    My son is 5.3 years old, his weight is 17 kg, but his penis size is 1.5cm after stretched. Is there anything we can do so it comes in normal size? As I also feel shy to talk about it to doctors.

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  8. Ellen Ledesma

    Hello, when measuring my son’s penis should I go by the stretched or the erect measurement? It appears that the erect measurement is about half an inch longer than the stretched measurement.

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  9. Joh

    My 11 y/o son has an 8cm penis. Is this normal

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  10. ann

    Hi doc.

    My son is turning 4y/o this coming May. His penis size is about 3.75-4cm. Is this normal?
    Many thanks.

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  11. Glen

    Hi Dr,

    My sons is turning 3 in a couple of months. His penus is about 2 centimetres long. Is this normal?
    He has been circumcised.

    Thanks.

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  12. KLEE

    My son just turned 2 years old and his penis is 3 CM is this normal? When he was born a urologist questioned if he had micropenis the endocrinologist didn’t say, just that he was smaller than average.

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    • RWIL

      Is that 3cm stretched?

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  13. maulik

    my son is 5 year old ,his penis size is 20 cm, pls suggest it is normal or not

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    • Gary Lloyd

      I seriously doubt that your 5 year old son is 20 cm… did u pull his skin forward instead of back to measure? less than 7 cm would be about average.. 20 cm is very unlikely

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  14. Jack

    You’re very lucky I’m 14
    And my penis is only 9.5 cm
    Erect so your penis is more than double mine

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