Baby Moved to Tears as Mother Belts Song in Viral Video

Ten-month-old Marie-Lynne has emotional reaction to her mom's beautiful voice.
2:35 | 10/30/13

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Transcript for Baby Moved to Tears as Mother Belts Song in Viral Video
Almost 5 million hits right now for 10-month-old mary lynn, emotional reaction when her mom sang "my heart can't tell you n no." ♪ So, I left you here no way to know ♪ ♪ I would wake up missing you wake up missing you ♪ you feel the pain from the song, huh, honey? Those tears. Are you crying? Oh. You're crying. Mommy's done. Are you okay? It's just a song. It's just a song. We know what sam thinks about all this. We'll talk to dr. Jen ashton. I'm crying now. I can't help it. I'm crying. Look, I mean, what this brings up is actually an area of pretty intense research for newborns and babies and how much they understand emotionally. What they can hear. We know that babies can hear music in the uterus. And they come out and can recognize their mom's voice. But we have to be careful -- does this baby understand the meaning of these words? No. Exactly. No. No. I'm just thinking there's a diaper to be changed. Right. I've seen that look a thousand times. That's when you hand it back to the mom. And there you go. Or you readjust the diaper. Maybe something's pinching the baby. Is that ruining dreams? Yes. Yes. I mean -- the baby doesn't understand. And it can be responding to mom's song. We know the babies mirror facial expressions. By 9 or 10 months of age, they can distinguish between a happy face and a sad face. Full disclosure, when my son was a toddler. I attempted to sing to him. And he said, mommy, your singing hurts my ears. Maybe that's what this baby was trying to convey. But this woman has a beautiful voice. I still think you're going to be a great dad. Yes. And also, we also know that this mom did sing to this baby multiple times. And always has this reaction. Oh, well that's different. Oh. I didn't know that. Scientific study involved. That changes everything. Exactly. Or not. Thank you very much.

This transcript has been automatically generated and may not be 100% accurate.

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