Professional singer or not, if you inhale helium, you sound silly. That was the point for Carrie Underwood when she sang "Happy Birthday" to her son Isaiah on Wednesday.

The "Love Wins" singer sucked on a yellow balloon before launching into the song, sending her newly 4-year-old into giggles.

The singer's husband, NHL star Mike Fisher , posted the exchange on Instagram, captioning the video of his squeaky wife cradling their newborn, Jacob , "Happy Birthday Isaiah!!"