Carrie Underwood — and New Baby! — Give Hilarious Birthday Serenade to Son Isaiah [Watch]

Underwood’s older son turns 4 today, and the singer–plus little baby brother Jacob–gave him a rousing (and funny) happy birthday song.

Turning 4 is a big deal, and that’s exactly what Carrie Underwood’s older son Isaiah did on Wednesday (Feb. 27). To commemorate the occasion, Underwood gave him a serenade that only a preschooler could fully appreciate.

In a video posted by dad Mike Fisher, Underwood takes a big suck off of a helium balloon (presumably there as decoration for the big day), and sings a resulting super-squeaky version of “Happy Birthday”—including a particularly drawn-out “dear Isai-ah-ai-ah-ai-ah”—that puts the young guest of honor in stitches.

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