I wonder that too. Like babies and babies that haven't even been born yet. Like will they be born in heaven or taken out of the womb in spirit to go to heaven? I think all innocent kids and babies will be going to heaven in the rapture but still get confused a good bit about things.
Welcome to the forum, cheryllei9h, I hope your time here will be blessed and that you in turn will be a blessing to those here.
I am a firm believer that physical life begins at conception, and that should children die, whether in the womb or after birth, they are going to be judged according to the same pattern we see in regards to judgment throughout Scripture, which is a direct accountability for the revelation God has provided to every man and woman. So when it comes to babies and children, and even those mentally incapacitated, God's grace is seen in His righteous judgment.
We know that babies in the womb do not sin, that is simply something that is an impossibility. And while popular belief would teach Sin as a disease passed down from parent to child, that is not the case. Sin is a consequence of Man's condition, which is one of not having the spiritual life that only comes from God. So while the babe in the womb has not sinned, that babe is still separated from God, and this is where we see the Grace of God throughout the Scriptures: God bestowed grace to the Old Testament Saints in the same manner He bestows grace to those babies.
Men like Noah, Abraham, and David...all died still in need of the eternal redemption Christ accomplished for us (both Old and New Testament Saint) on the Cross. When those men died, the last offering for sin would have been the sacrifice of an animal, who vicariously died in the place of the sinner, that the penalty for sin not be exacted on the sinner themselves. This atonement was temporary and temporal, and not to be equated with the Sacrifice of Christ, for we are told those sacrifices could not take away sins:
Hebrews 10:1-4
King James Version (KJV)
10 For the law having a shadow of good things to come, and not the very image of the things, can never with those sacrifices which they offered year by year continually make the comers thereunto perfect.
2 For then would they not have ceased to be offered? because that the worshippers once purged should have had no more conscience of sins.
3 But in those sacrifices there is a remembrance again made of sins every year.
4 For it is not possible that the blood of bulls and of goats should take away sins.
So we see a pattern of righteous judgment, and judgment according to the obedience, or disobedience, to the known will of God, revealed to man with the specific intent of establishing relationship with man.
So in regards to children, it is my belief we can draw a conclusion concerning the fate of children who die prior to a point in their lives where they could be held accountable for their response to the three primary methods of revelation (the internal witness, the testimony of Creation, and direct revelation (God speaking directly, through Prophets, and through His Word)), and that is...they receive the same grace bestowed to all Old Testament Saints.
From a general perspective it is necessary to discuss where men went when they died, and whether that has changed in this Age. Did men go to Heaven when they died then, or were they assigned a place in sheol/hades. All of these could be topics in themselves, and when we begin to put the collective teachings together, I think we can draw conclusions in regards to the fate of children in the Rapture. My view is that only the Church is raptured, so children who have not been saved at this time will remain in the world. The babes of unbelieving mothers will remain in the womb, and the babes of believing mothers will be raptured. Just as in the flood, God's mercy extends even to those who die due to the consequences of sin, and the judgment we see in the Tribulation is definitely a consequence of sin.
It might sound harsh, but that is my view. I do not view the death of children in the Flood, for example, cruel to those children, but rather mercy which spared them the likely result of growing up to reject the will of God, as the rest of the earth had done.
God bless.