Lower the saddle height by 1/4". See if that's any better. Since it's a new bike, are you a new rider? Typically, a person's butt can be sore from the saddle pressure for the first ten days to two weeks of riding. Then the soreness goes away, if the saddle position is close to correct. Don't ignore the front/rear adjustment. I once developed a little knee tenderness, moved the saddle forward 1/4" and the soreness went away. Don't make the mistake of thinking that more padding on the saddle is the answer. That's seldom the case. Whatever you do, don't stop riding. Make small adjustments to the saddle position and your butt will toughen up. Good luck.