Due to an equipment failure on the day with the 3 axis gimbal that the film was intended to be shot on. Director Matt Stacey had to step in last minute to shoot the long unbroken shot on the Steadicam. He had rehearsed the shot as a back up with stand ins but never with the actresses.
In addition to a problem with the gimbal on the day, the RED Weapon camera the film was intended to be shot on also developed a glitch meaning the crew had to quickly rig the back up camera which was an Sony FS7.
Originally there was supposed to be a dog as part of the scene and was even used in rehearsals, but it's part had to be cut after it kept eating the props during resets.
The baby in the film is actually Producer Becky Stacey's cousins daughter.
Because it was unsafe to leave the baby unattended in the pram for the entire length of the scene, the crew engineered a short window whether the camera moved away from the table so that the baby's guardian could place her in the pram before moving back to the shot.