Tiny baby Christian Jones can be heard saying hello at just two months old in this cute Snapchat video recorded by his mum.
Samantha was hoping for a smile or a cute laugh as she recorded the message for her friend Amber.
So she was shocked as he copied her mouth action and replied "hello".
She uploaded the footage to her Facebook wall and the video has been watched more than 700,000 times in just three days.
The 19-year-old mum told People.com she was left open mouthed when her boy replied so clearly.
Samantha said: "I couldn’t believe it. I was like, 'No way, you did not just do that'."
Samantha, who lives with her husband Dylan in Jackson, Michigan, in the USA added: " Snapchats are only 10 seconds, and it happened at the end, I was just hoping he would smile or laugh or do something baby-like.
"But you can clearly see his mouth form the word and he says it exactly how I say it!”
"Like he was mimicking me."
She added: “He loves to copycat everything I do.
"He’s so smart and special. He’s very conservative and curious about the world around him."