An FBI complaint charges 34-year-old Jennifer Marie Vargas of San Antonio with assault within maritime and territorial jurisdiction resulting in serious bodily injury. Vargas, who was arrested Wednesday, remains in custody pending a bail hearing Monday in federal court in San Antonio.
The boy's father is in the Army. The incident happened Sept. 27 at the family's home at Joint Base San Antonio-Fort Sam Houston.
Prosecutors say the father returned home from work, found his injured son and took him to a military hospital. The boy, who's recovering from a lacerated scrotum and bruising, remains with his father.
Authorities are investigating why the mother was angry.
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