This one is sure to put a smile on your face -- a team of Japanese researchers found that sleeping baby monkeys could shed light on the origins of laughter and smiles in humans. When either a chimp or ...

Six weeks after giving birth, I finally got a smile from my newborn baby girl. For over a month, I lived in an endless cycle of feedings, diaper changes, and power naps. The smile jolted me out of my ...

Very few people can resist smiling at a newborn baby — signaling positive emotions, such as joy and interest. Of course, this is especially true for new parents. One study found that new mothers ...

Babies smile before they are born. That same sweet smile is the smile babies do in the first few weeks of life. It is called a reflexive smile. These smiles are random and spontaneous. They usually ...

Very few people can resist smiling at a newborn baby—signalling positive emotions, such as joy and interest. Of course, this is especially true for new parents. One study found that new mothers looked ...

When human and chimp infants are dozing, they sometimes show facial movements that resemble smiles. These facial expressions, called spontaneous smiles, are considered the evolutionary origin of real ...

"It puts a smile on our faces and we thought it could do that for others as well," Lauren Vinje tells PEOPLE What a smile! A photo of grinning Freya Vinje when she was just 5 days old is instilling ...

Babies can smile in the womb, even before they are born. A baby’s earliest smiles are reflex smiles, not an attempt to imitate or engage with adults. As babies grow, they develop more social skills ...

About a week after the birth, Freeman and his wife, Stephanie Murdock, noticed that the baby exhibited extreme fussiness, grimacing, clenched fists, and stiff arms and legs. Murdock, who was ...

video: The short, lop-sided smiles of baby Japanese macaques. When human and chimpanzee infants are dozing, they sometimes show facial movements that resemble smiles. These facial expressions -- ...