Many stone status at Adashino-Nenbutsuji Temple in Kyoto
These are small tombs for miscarried babies and those who had no relatives. Some of them were carved with buddha image on the surface and the other carved with guardian deity of children, called Jizo in Japanese, though it is hard to recognize because of the long-exposure to the air and totally the worn-out surfaces.
By the way, we call babies aka-chan. Aka means red and chan is something of a title for babies or children or cute girls in Japanese. The color, red, means baby in this case, so the red apron is hung on the status.