The fire broke out at a home in the area of 12th and E Streets in Merced just before 10:30 a.m.
Family members tell Action News three-year-old Kareem Butler, Jr. died in his crib in the fire.
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The preliminary report says the fire was started by the child's older sibling who was playing with a lighter.
There were at least four other people in the home at the time of the fire, and they all got out safely.