A third explanation relates a child's destiny to the acts the child would have performed if allowed to grow up. The discussion cites the phrase الله أعلم بما كانوا عاملين
God knows best what they would have done.
The phrase points to divine knowledge, but a complete inference about a specific child's final destination would need further argument. “God knows” is not equivalent to “I know the precise fate of this child.”
This echoes the counterfactual in the earlier three-brothers exchange: what if the child had lived longer? Yet the questions differ. The earlier dialogue tests a purported rational obligation; here a theological view is being linked to a Prophetic expression concerning divine knowledge.