Children bumping in our table, runing arround all over the vessel from the lower deck all the way to the upper deck, unsupervised. Multiple guests talked to one of the officers and he said that he told them to not run, but they don't listen. When the kids started bumping into a pregnant wooman, hurting her, I attempted to bring to cpt. Kelly's attention that some 6 yrs old are running with real glasses close to their face and doing cartwheels, but he declined to listen and ignored me. This is a dangerous situation where children life's are endangered and the cpt. deliberately refused to take action. Our evening was a constant concern if someone would get hurt on that ship.