The 29-year-old operator of an unauthorized nursery in Yamato, Kanagawa Prefecture, pleaded guilty Friday to fatally injuring a toddler at the facility but pleaded not guilty to another infant's death.

Junko Izumo, who runs Smile Mom Yamato Room, also pleaded guilty to injuring a third child but pleaded not guilty to hurting three others during the first hearing of her trial at the Yokohama District Court.

The defendant admitted shoving a 2-year-old boy in the nursery in February, causing his death from a fractured skull he sustained in his fall.