The woman, Deanna Robinson, is a decorated Air Force veteran. She has since given birth to a healthy baby boy, despite being 38 weeks pregnant last month.
Video that surfaced on YouTube showing what appears to be a Hunt County Sheriff's Deputy seen punching Robinson while her hands are cuffed behind her back.
Robinson says her belly hit the kitchen counter repeatedly during the incident, causing heavy bruising.
Robinson says on March 4, deputies and Quinlan police showed up at her parents' home for a scheduled CPS interview regarding a previous domestic dispute with her husband and involving her 18-month-old son.
She says the officials refused to show her paperwork, and she began to close the front door. That's when they reportedly stormed in and put her in cuffs.
Robinson yells and then the punching begins before the video cuts out. She says what isn't seen on camera are the punches that follow -- four or five total.
Robinson says the video was taken by a home security camera at her parents' house that only records in 30-second clips, which is why it cuts off abruptly.
The Hunt County Sheriff, Randy Meeks, released a statement saying the incident is under investigation and that all allegations of misconduct are taken seriously and more information will be released when the investigation concludes.
Robinson is charged with assault of a public servant, resisting arrest and interference with child custody.