Three ambulances rushed to the set of the production after onlookers dialled 999.
A source told The Sun about the incident: “It was very distressing. The child was very ill.”
One resident living nearby Longcross Film Studios at Chertsey, Surrey, said: “I saw three ambulances whizz past. I was shocked.
“It looked like something you’d see on a TV show but it was obviously a real incident being taken incredibly seriously.”
They continued: “We never see anything like this happening in this part of the world. Everyone was talking about it.”
The emergency is said to have been in response to a “medical incident with an infant” that paused filming, according to an insider.
Sources have revealed that the anonymous baby was discharged yesterday and now recovering at home.
Call the Midwife is based on the memoirs of a midwife, Jennifer Worth, and stars Helen George.