“Family of 5! Welcome @mavericknphelps to the world! Born 9-9-19. Mama and baby are healthy and the boys are pumped to be big bros! #housefullofboys” Phelps wrote in a caption accompanying a photo of wife Nicole holding young Maverick, surrounded by Phelps and the couple’s other two sons, Beckett Richard, 18 months, and Boomer Robert, 3. Within an hour, the post had more than 87,000 likes.