A mother is suing a child care center after she claims her four-year-old son was encouraged to participate in a “fight club”.

Nicole Merseal said her then 10-year-old son filmed video of his four-year-old brother being repeatedly punched at a daycare centre in St Louis, in the US, in December 2016, FOX 2 reports.

Ms Merseal claims that the day care centre organised a “fight club”, according to court documents.

Video shows one child with a Hulk fist, a large green glove, on his right hand, punching another boy as he lies on the ground. A circle formed around them, as adults, watched on, along with other children.

She told ABC News her four-year-old was “very afraid” and had trouble understanding why his best friends were beating him up.

“He just doesn’t understand why they punched him in the face,” Ms Merseal said.

“I don’t know any parent that could watch their children go through this and not be upset.”

She added that the day that on which the event happened was her son’s birthday.

Daycare cameras recorded more than 30 minutes of the kids fighting, WNEP 16 reported.

Ms Merseal told Fox Now 2 that her older son texted her saying that the day care was “making them fight.”

The day care center’s director, Jennifer Scott, said that the children were bored that day and she admitted to having the kids fight each other with the “Hulk Hands” to release stress.

She claims it didn’t last for more than about four minutes and that none of the kids were hurt. Ms Merseal isn’t satisfied and is suing the day care centre for more than $35,000.

Share your comments below