Babinski-Fröhlich syndrome or Adiposo-genital syndrome: Condition characterized by feminine obesity and sexual infantilism in case of pituitary tumours.

Sexual infantilism: in pursuing and satisfying his or her libido (sexual drive), the child might experience failure (parental and societal disapproval) and thus might associate anxiety with the given erogenous zone.

Results in partial or complete feminization and undervirilization in males and in a delayed, reduced, or absent puberty in both sexes, in turn causing sexual infantilism and infertility, among other symptoms.

The conventional definition of infantilism means the persistence of childlike traits in adults and medically the failure to attain sexual maturity, and "sexual infantilism" is also used medically as a synonym for delayed puberty.

Terms such as "genital infantilism" (infantilism in development of genitals, hypogenitalism), or "sexual infantilism" (lack of sexual development after expected puberty or delayed puberty) may still be seen, and are considered to be synonyms of hypogonadism.

A related condition is follicle-stimulating hormone (FSH) insensitivity, which presents with similar symptoms to those of Leydig cell hypoplasia but with the symptoms in the respective sexes reversed (i.e., hypogonadism and sexual infantilism in females and merely problems with fertility in males).