Here’s the deal Roman Catholics don’t understand because their church has blinded them.
When a belief, practice or article of faith is explicitly taught in Scripture, it is incumbent for the Christian to follow that belief, practice or article of faith.
When not specifically spelled out in Scripture, the Christian has the liberty of conscience to follow that conscience.
Scripture does not clearly spell out the fate of babies who die in infancy. Therefore, we look to the rest of Scripture to formulate an opinion. And it’s just that. An opinion.
I’m content to believe babies who die in infancy go to heaven. I can certainly understand the alternate view that some may go to heaven and others might not.
But Scripture is very clear that there is no such thing as Limbo. Limbo is a figment of Rome’s over-active imagination. It is flagrantly false. It is a lie. And it leads to other errors.
You can’t see it, but you just basically re-stated the Catholic approach to the question of scripture and infant death. Currently we lean, based, as you do, on other scripture, that God calls children to him.
However, for many Reformed, problem of infant death is only magnified by their doctrine, specifically the Westminster Confession of Faith.
The question of the death of children exposes the problem with the doctrine. To be consistent with doctrine your “free” belief must mean that only elect children die young and reprobate children never die young.