This is the shocking moment a woman crashes into a youngster on a waterslide as the dad strays from the safe area.

CCTV footage shows the child's father holding him in his arms as he swims directly into the slide's exit path at the Rodeo Drive water park in St Petersburg, Russia.

Despite staff members reportedly shouting warnings, the father proceeds forward.

Seconds later, a woman exits the slide at high speed and crashes into them, striking the child in the abdomen with her feet on August 5.

The Investigative Committee found that the six-year-old sustained serious injuries and was rushed to the hospital, where doctors diagnosed a ruptured liver.

Emergency surgery was performed, and the son regained consciousness. He remains in the hospital while he recovers.

The woman who crashed into the child has reportedly apologised to the family. The boy's parents have stated they do not blame her or the water park for the incident.

A preliminary investigation into causing serious bodily harm through negligence has been opened against the father.

Neither the woman who came down the slide nor the water park itself is under inquiry.