Country star Carrie Underwood is juggling her two tots like an absolute champ. Just a month after giving birth to son Jacob, a new social media post shows the "Love Wins" vocalist cradling her infant and simultaneously singing to big brother Isaiah for his birthday. In the quick online snippet shared by husband Mike Fisher, Underwood wears a Bebe au Lait cotton nursing cover while balancing Jacob in one hand and a yellow balloon in the other. As she sits across from the 4-year-old birthday boy, she takes a long helium drag and belts out "Happy Birthday" in the most laughably high-pitched voice ever. Jacob kept his cool while Carrie serenaded Isaiah 바카라 게임 웹사이트� he might have slept through the whole thing. This marks the newborn's second Instagram appearance since his birth announcement on Jan. 23. After the personalized performance, an elated Isaiah snatched the balloon for his own enjoyment while Jacob continued to doze. On top of her growing family, Underwood also has a jam-packed schedule as she kicks off her Cry Pretty 360 tour this May. Until then, though, here's hoping we get to see plenty more snuggly insights into the Fisher family.