I have every confidence that your child is now safely in God's presence in heaven. When King David's infant son died, he mourned for him, but he also knew that someday they would be reunited. He said, "Can I bring him back again? I will go to him, but he will not return to me" (2 Samuel 12:23).
Almost nothing in life is harder than losing a child -- and God understands the sorrow you and your husband feel. After all, God knows what it is to lose a dearly-loved son -- for His only Son died on a cruel Roman cross and was placed in a borrowed tomb. Poets and hymn writers have pictured all heaven as weeping at Jesus' death -- and I think their portrait is true.
Remember: Death was not part of God's original plan, and every death (no matter at what age) is a witness to the terrible consequences of sin. But remember, too, that Jesus did not stay in the tomb! He rose from the dead by the power of God, and that great truth gives us comfort and hope. The Bible says, "For the wages of sin is death, but the gift of God is eternal life in Christ Jesus our Lord" (Romans 6:23).
May God comfort you as you turn to Him. And may your son's death remind you also that life is brief for all of us, and now is the time to open our hearts to Christ and live for Him every day.