Pam Sapp recorded a video of her grandson, John David Marlin, reciting the alphabet. Marlin, who struggled with speech delays, had been attending speech classes to improve his pronunciation of words. The results of his hard work are now warming the hearts of millions.

"We were so amazed," Sapp told ABC News. "Within the last year, he's been starting to say a few words like 'mama and dada,' but for him to articulate each letter, that was was amazing to me."

John's mother, Hannah Marlin, has been taking her son to early intervention and speech programs since he was 6 months old to make sure his learning is on track. On Jan. 24, the efforts paid off and John sang his alphabet song clearer than the family had ever heard before.

"He was cracking all of us up," she said. "I'm so proud of him and the fact that he's able to bring awareness to (Down syndrome)."

His proud grandmother shared her favorite part of the video, writing, "Wait for the W" in the Facebook post. The sweet performance has racked up more than 13 million views.

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