Ojizō-sama statues are sometimes accompanied by a little pile of stones and pebbles, put there by people in the hope that it would shorten the time children have to suffer in the underworld. (The act is derived from the tradition of building stupas as an act of merit-making.)
The statues can sometimes be seen wearing tiny children’s clothing or bibs, or with toys, put there by grieving parents to help their lost ones and hoping that Jizō would specially protect them. Sometimes the offerings are put there by parents to thank Jizō for saving their children from a serious illness.