A 24-year-old woman was arrested Tuesday on suspicion of cutting off part of her 4-month-old son's genitals early last month, police officials said.
Shizue Tamura from Izumi, Osaka Prefecture, told investigators that she used a safety razor to attack her son's genitals at her apartment March 1, the officials said.
The toddler's injury will require two months of treatment.
Tamura was quoted as telling police that she committed the crime "in a fit of general mistrust of the male sex," as she had been abused since her childhood.