Hashem never “doesn’t answer Tefillos”. Hashem saves every Tefilla uttered by every Jew and Uses it when He decides it is needed. We can never know what our Tefillos accomplish. Sometimes, we daven so hard for a Yeshuah, but we don’t get we want. In such cases, Hashem has decided to say “no”, and save the Tefillos to be used later.
We, down here on earth, with our limited vision, can only hope and believe that what happens is the best for us and Hashem is taking care of us.
I hope and daven that the baby has a Refua Sheleima B’karov, and the family has the strength to overcome this tragedy.
May Klal Yisroel only see Simchos.