You asked — “What happens to babies born after the rapture?”
They live during the Millennium, the 1,000 year reign of Christ on this earth — the Kingdom of God.
And..., the ones who accept Christ as their Savior during the Tribulation (likewise, “after” the Rapture) also live during the Millennium.
I hope that solves the puzzle for you...
You might find it very interesting to read Randy Alcorn’s book on “Heaven”. It’s extremely enlightening. It even opens the eyes of Christians (if you are one) and presents a totally different picture of Heaven to those who aren’t Christians.
http://www.amazon.com/dp/0842379428/
How do you know some Souls might reside in the heavens (New) while new bodies in Christ will reside on the New earth?
I have a question for you. What does it mean in Revelation 20 where those who died DURING the tribulation took part in the FIRST resurrection. Please read the whole chapter, because if the resurrection mentioned in Thessalonians is the first resurrection (preceding the rapture of the saints),then this resurrection of the dead when Jesus comes back at the end of the tribulation is NOT the FIRST resurrection as is stated twice. I know it is confusing, but I believe Thessalonians refers to the end of the world and the last battle.
Those who are beheaded during the tribulation are the first to rise from the dead at the ONLY return of the King of Kings, at the end of the tribulation as is stated in Rev. 20. Its best to read books as a whole.