Will a child who died at the age of two from heart and liver disease be held accountable on the Day of Resurrection?

A boy who has not reached puberty will not be held accountable on the Day of Judgment, due to the saying of the Prophet, peace and blessings be upon him: "The pen has been lifted from three: from the sleeper until he awakens, from the afflicted until he recovers, and from the boy until he grows up." As for the children of the monotheists who died before puberty, they are in Paradise, due to the saying of the Prophet, peace and blessings be upon him: "And the newborn is in Paradise."