Carrie Underwood says she had to break a car window Saturday after her infant son Isaiah was accidentally locked inside. "When your dogs manage to lock themselves, all your stuff & the baby in the car & you have to break a window to get in," the first-time mom tweeted. "#WhatAreTheChances." Underwood, 32, did not say where the incident happened or what she used to smash the glass. The country music star and former "American Idol" winner married professional hockey player Mike Fisher in 2010. The couple welcomed their first child in March.