boy peeing constantly

Each nappy change my 4 week old wee's everywhere. I just went through 3 bloody nappies in one change just catching his wee!!! 
Anyone got any advice on preventing this or something as it drives me mad!
I don't like to then use the wet nappy on him because he has a sore bum. I did use a Muslin cloth to cover his bits but found he would still wee and it would drop down and soak his clothes grrrr!