Its been six months since Rascal Flatts‘ Jay DeMarcus and his wife, Allison, brought their baby boy home from the hospital. The Rascal Flatts bass player tweeted a photo of his smiley son on Saturday morning, sharing that his first son is a delight. “Our baby Dylan is the happiest baby ever!!!” he wrote. He’s not lying — Dylan is one happy kid. In the photo, he’s sitting on a plush chair, hugging himself and kicking his feet — all while holding the biggest grin on his face