It's a hot, lazy summer day, peaches are in season, and Japanese parents are the only ones doing the proper thing with that information: putting peaches in front of baby butts and taking photos:
It apparently started from a challenge the printing company Kodomono gave to Instagram users, seeking creative photos of children. One photo covered up a baby's butt with a strategically placed peach, and a meme was born across the Pacific under the hashtag #桃尻, which means "peach."
Cute, until you remember what a peach actually looks like coming out their little bottoms. All this recalls when Japanese parents couldn't stop comparing their kids' arms to bread rolls:
As long as Japanese parents don't start cannibalizing their kids, it's good.