And as Jesus passed by, he saw a man which was blind from his birth. And his disciples asked him, saying, Master, who did sin, this man, or his parents, that he was born blind? Jesus answered, Neither hath this man sinned, nor his parents: but that the works of God should be made manifest in him. (John 9:1-3, KJV)
All i can say, as an encouragement to you is if you or your child or your close one were born with a challenge - you should not blame God for it. He IS Perfect and He made us to be perfect and EVEN though we have sinned and made ourselves mortal and with issues, He still had predicted, and planned and provided a way for us to become like Him again, through the blood of Jesus Christ, who died on the cross and shed His blood for the remission of our sins. He was buried and then bodily rose from the grave three days and three nights later. Jesus Christ is the Lamb Who was sacrificed for us. Through the blood of Jesus Christ we (all who believe in Him) are made perfect in spirit again (even though we are still in our imperfect bodies)and this is how God sees us (through the blood of Jesus).Eventually, He will give us new bodies in eternity, for now all we can do is to bare with what we have and have Faith and wait for sweet Jesus to come back!