Question 548: What is the ruling on non-Muslim children who die in childhood? Will they be admitted to Paradise or Hellfire?
Answer: The non-Muslim children in this world fall under the same ruling as their fathers; but as for the Hereafter, the correct scholarly opinions in this regard are two:
The first is that they will be put through the test of whether or not they will accept Islaam. They will be called to embrace Islam; whoever accepts will be saved and admitted to Paradise, whereas those who refuse will dwell in Hellfire… read more here.