I understand the other side of the argument and I have heard it all, but sorry I don't agree with it.
Even in life's hardest moments, such as when a child passes away, God's love is sufficient. He loves children and He loves babies. He loves the pre-born and the newborn. He loves the infant and the toddler. The words child and children occur 94 times in the Gospels, telling us they're as important as any other element in the story of Jesus. God is not willing for any of these little ones to perish.
The Lord creates every single life, and every baby is precious to Him from the moment of conception. God told Jeremiah, “Before I formed you in the womb I knew you.” Jesus taught us that not even a sparrow falls to the ground without God's notice, and we are worth more than many sparrows. He rebuked His disciples for keeping the children from Him, and He said, “Let the little children come to Me...for of such is the kingdom of heaven.”
If you are someone you know has a lost a child, remember that Jesus knows and loves every child, born and pre-born, His love is infinite and utterly sufficient, and little ones are safe in His arms.
We ought to be greatly comforted by the knowledge that this little one is in heaven, in the presence of Christ, enjoying all the wonders of that glorious place, free from all the troubles of this earth, dwelling in perfect bliss, surrounded by perfect love, and loving and worshipping Christ perfectly in return.
Even so it is not the will of your Father who is in heaven that one of these little ones should perish.
Matthew 18:14
There was a miscarriage in the family some years ago. Very strange. A person lives and dies without any hellos or goodbyes. But the knowledge of that child's being in the arms of Jesus is a great comfort and consolation.
God's Mercy is infinite. I'm sure that the Most Precious Blood Jesus shed during His Passion and Death covers all contingencies