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DrGreene Content
 How can I tell if my baby’s penis is the normal size for his age?
 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):
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Age
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Normal: Mean +/- 1 SD (inches)
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Abnormal: Mean - 2.5 SD (inches)
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0-5 months
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1.5 +/- 0.3
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0.75
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6-12 months
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1.7 +/- 0.3
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0.9
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1-2 years
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1.9 +/- 0.3
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1.0
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2-3 years
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2.0 +/- 0.4
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1.1
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3-4 years
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2.2 +/- 0.4
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1.3
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4-5 years
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2.2 +/- 0.4
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1.4
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5-8 years
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2.4 +/- 0.4
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1.5
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8-11 years
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2.5 +/- 0.4
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1.5
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Adult
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5.2 +/- 0.6
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3.7
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Alan Greene MD FAAP
Reviewed by: Khanh-Van Le-Bucklin MD & Rebecca Hicks M.D.
Originally published: February 05, 2001
Last reviewed and updated: April 2008
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