Warning after bogus midwife examines pregnant woman.
Police have issued the warning to all mothers-to-be in South Wales following the incident in Caerphilly on Monday evening.
The 23-year-old woman, who did not want to be named, let the bogus health visitor into her home after she was told her child could have something wrong with its stomach.
The alarm was raised after the visitor had left, when the victim called the health authority and was told the caller was not a qualified midwife.
The caller had carried out an examination of the woman's stomach.
Detective Sergeant Mike Vaughan of Gwent Police said the incident was highly unusual but very frightening for the victim.
He said, "It is concerning that a person had gained trust and access to someone's house under a false pretence and has breached that trust.
"We would appeal to anyone who may have been subject to a similar incident to come forward."
Police said the bogus caller was white, in her late 30s to early 40s, of stocky build with shoulder-length permed, dark brown hair.