Rice balls are a traditional Japanese food. They consist of balls of white rice stuffed with various salted foods and wrapped in seaweed. They usually look something like this:
Babies are a type of human. They're like regular humans, but smaller. They often have some extra fat on their bones, known as "baby fat." They usually look something like this:
Japanese comedian Masahiro Ehara noticed that when he squished his babies' faces, they kind of looked like rice balls.
After he shared the pictures on social media, "Rice Ball Babies" quickly became a popular meme, inspiring a bunch of imitators:
Babies have never looked this edible.