The child's father and four-year-old sibling also suffered burns after the blaze broke out in Ffair Rhos village in Ceredigion.
Detective Chief Superintendent Steve Cockwell said:"Our thoughts are with his family at this extremely difficult and traumatic time, and specialist officers have been put in place to support them.
"We are also working closely with Mid and West Wales Fire and Rescue Service, who were in attendance when our officers arrived. "We would like to speak to anyone who was in the Ffair Rhos area around the time of the fire, who might have information that could help our investigation.
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