A MELBOURNE mother has been kicked out of the popular musical Book of Mormon because she brought her three-month-old baby to the theatre.

Beth Caple and her husband took their son, George, to the Princess Theatre in a pram to see the popular show on Thursday night.

Initially venue staff were accommodating, offering to swap her level three seating for some on level one.

But then five minutes into the show, after breastfeeding George to sleep, an usher told Ms Caple that producers had requested that she leave.

“I was thrown aback,” Ms Caple told 3AW radio.

“If I knew that my baby was one to just go off and cry, obviously I would never have put myself in that situation.”

Theatre company Marriner Group general manager Glenn McGuinness told 3AW the woman was never asked to leave, but producers did raise concerns for the welfare of the infant.

“Part of the show there’s a lot of loud noises, there’s a gun shot, the tone of the language can be quite aggressive also, we were quite concerned it wasn’t appropriate for an infant,” he said.

He conceded that staff impressed upon her the tone of the show and whether it was appropriate for a child, but strongly disputed her claims that the mother was told to leave.

“The mother chose to leave very soon after the start ... she definitely was not asked to leave, she left voluntarily,” he said.

Ms Caple maintained her baby never cried, but agreed taking a baby to the theatre was a risk.

She has since emailed the production company asking for a refund for their tickets.

“I’m a mother,” she said.

“I should be able to feel like I can attend these things just as much as anyone else.

“An apology would be nice.”

Book of Mormon, created by South Park‘s Trey Parker and Matt Stone, is one of the most successful musicals of all time with nine Tony Awards and a Grammy to its name.

It has broken the Princess Theatre’s house record for the highest-selling on-sale period of any production in the theatre’s 159-year history.