Rosemary Harrah of Needville is in custody and has been charged with injury to a child, but detectives say the charges could be upgraded to capital murder.
Fort Bend deputies were called to a home on the 12100 block of Mueck Road after receiving a tip that a child had died.
During an initial interview, Harrah told detectives that she had found her 2-month-old son, Lucian Angst, unresponsive.
Detectives later received a tip that Harrah had made posts on a social network for expectant women expressing that she wanted to harm her child. During a follow-up interview on Dec. 27 with detectives, Harrah admitted to causing the child's death on Dec. 11.
"She admitted to me that she placed a blanket over the child's face," Fort Bend County Det. Thomas Cantu said.
Harrah is currently being held in the Fort Bend County Jail on a $500,000 bond. An autopsy is underway on her son.