The mother of an infant who died after ingesting a sedative drug in Burlington County has been charged with manslaughter. Vanessa Hampton, 32, of the Frankford neighborhood of Philadelphia, was arrested by Philadelphia Police last week. In addition to the manslaughter charge, she is also facing the third-degree offense of possession of a controlled dangerous substance, the Burlington County Prosecutor’s Office said in a news release on Thursday. Hampton’s 10-month-old son was found unresponsive at a home in Medford in November 2022, officials said. After police arrived on the scene, the boy wa…