And, as Buchanan describes in her video, Christian grew into a happy baby who, in the face of strangers' comments, "would start giggling ... and they would giggle, too," which eventually spurred an outpouring of messages to her family on Facebook, and well-wishes in public from people who recognized them after hearing about their story.
Only at the end of the video does she turn Christian around to reveal his face to the camera, and she lovingly kisses his cheek while he sucks on a pacifier (which he is now able to do because of surgeries on his cleft palate).
She posted the video two months ago, and it has since generated nearly 7 million views and 1.8 million Facebook "likes" after an inspired fan reposted it on the Christian video site GodVine.
Because of the attention, Buchanan has connected with three other people who have Tessier cleft -- two adults and the parent of another -- and she said the support has been lifechanging.
"I try to make the best decisions I can for Christian, especially medically, and sometimes I'm put into corners, where whichever decicion I make is going to impact Christian's life," she said. "Being able to reach out to someone who has lived there [with his condition], it takes a huge burden off me."
Since making the video, she's also created a Facebook page for Christian, and receives so many messages of support that she now turns off her iPhone notifications at night so she's able to sleep.
Buchanan knows Christian faces a much more difficult road ahead of him than a baby born without his condition, but she's thrilled her video has inspired so many people.
"When Christian's old enough, let's ask him if he's glad I let him live," she said. "His laugh is so valuable, at 14 months old, and is making more of a difference than most people ever do."