What is the answer to the problem of innocent children's suffering in this world, which keeps some people from believing in Allah?

Allah is wise in all His commands and decrees, and He may conceal His wisdom from some of His servants as a test. We know that He has wisdom in everything He does, and our lack of knowledge regarding the details of this wisdom does not diminish the essence of His wisdom. The suffering of children has great wisdoms that may be hidden from some, including: indicating illness, the benefits of crying for the child, a lesson for their parents to turn away from forbidden acts, and reflection on the Afterlife. These pains are inherent to human existence. Allah created humans in a world of trial and tribulation with a weak substance susceptible to ailments. The existence of these pains is proof of the Hereafter, and wisdom necessitates the existence of two abodes: Paradise, the abode of delights, and Hell, the abode of pains.