The good but will tell you that pride goeth before a fall. It also says that he that humbleth himself that be exalted and he that exalteth himself shalt be abased.
Being proud of something you did or child's achievement is acceptable so long as you don't make others around you feel "less than". But being proud just to boost your ego, show off your new car or to make others think that you are better than they are is extremely wrong. Not good at all