Look at this picture.
Dr Cassidy said her mortuary technician knows on sight that it’s a toy. He has a wicked sense of humour, she said, and in front of the open-mouthed gardaí will throw the doll against the wall, telling them that’'s how he checks it’s not a foetus.

I can see how they make the mistake, but it's still pretty funny. And, how do the Guards react when she tells them that their fetus is a plastic alien? "They bounce".
The fact that doctors frequently make the same mistake is worrying, however.