Puberty

Many endocrinologists like to see a child around the age of 9, in order to let them become used to attending the hospital and to get to know their endocrinologist.

The age at which KS youngsters start puberty is the same as for other boys ie about 12 years of age when the testicles begin to enlarge. Puberty then progresses normally for the first two years or so. After this the testicles may stop growing or shrink slightly and testosterone levels may not rise rapidly above the age of 14 as would be usual.

About half will not need testosterone treatment until adulthood. However, testosterone treatment may be beneficial to those who are overweight.

Unless puberty has been delayed, it is probably not necessary to do checks until mid-puberty – 14 or 15.