is there an upper limit to penile size or circumference in a baby–and does a larger penis suggest any hormonal issues if it is in isolation (no androgenic hair or enlarged testicles)?
With regard to penile size, as one might expect, there are data for the mean +/- 2 SD for penile size at all ages, including 30 week and 34 week premies. Therefore the age of the baby in question is essential to accurately answer the question of what size is too big. For example, for a term newborn + 2 SD would be a stretched penile length of 4.3 cm. At 6 -12 months + 2 SD is 5.9 cm and at 2-3 years + 2 SD is 6.9 cm. The reference for this data is: The Johns Hopkins Medical Journal, vol 146 (4): 156-163, April, 1980. The +/- 2 SD data also needs to be taken in light of 2.5 % of normal boys will have a penile size above and below those cutoffs and still are perfectly normal. That being said, a penile size above + 2 SD may be the first sign of abnormal androgen activity. The further above + 2 SD it is the greater the possibility, in which case at least a Bone Age x-ray would be warranted, prior to a decision about an endocrine consult or measuring an androgen and androgen precursor profi
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