The Genital of adolescent (penis and scrotum or zakar) growth in few part that can predicted. Scrotum boys will not start growing until at least 9 years old he started to enter puberty or (normally boys experiencing puberty at age 9 to 14 years).
The penis can sometimes begin to sweep around the age of 9 years. But if your child is worried that his penis has not started to grow, do not worry. Sometimes the penis is not yet started to elongate or enlarge up to 14 year olds.
If no changes at the time he was 14, then consult with a physician may be required. The pediatrician or family health care provider can tell whether or not a normal child development.
Here the length of penis (not erection) when juvenile based on the book Adolescent Health Care: A Practical Guide, as reported by About.com, namely:
10 to 11 years: 1.6 inches (4 cm) to 3.1 inches (8 cm)
12 years: 2 inches (5 cm) to 4.0 inches (10 cm)
13 years: 2 inches (5 cm) to 4.7 inches (12 cm)
14 years: 2.4 inches (6 cm) to 5.5 inches (14 cm)
15 years: 3.1 inches (8 cm) to 5.9 inches (15 cm)
16 years: 3.9 inches (10 cm) to 5.9 inches (15 cm)
17 years: 3.9 inches (10 cm) to 6.3 inches (16 cm)
18 years: 4.3 inches (11 cm) to 6.7 inches (17 cm).
Penis size is measured by pressing the fat at the base of the penis and take measurements from there (very close to the body) to the tip of the penis. Measuring the size of the penis is complex and influenced by various factors. This can cause much confusion.
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