No children are mentioned in Daniel’s 70th Week or Rev 6-19. Is that because all children are raptured? Children are innocent; sinners of course, but not of age to even understand sin or commit their lives to Jesus. Will those living at the time of the rapture be caught up even though they are not part of the Church?
Pregnant women and nursing mothers are mentioned in Matt. 24:19 at the beginning of the Great Tribulation, which will begin at least 3 1/2 years after the rapture. Since Matt. 24 is about Israel the women who are mentioned will all be living there. But if there are pregnant women and nursing mothers in Israel, it stands to reason there will also be some in other countries as well. I think the world will only be without children for about 9 months after the rapture.
I believe all children under the age of accountability at the time of the rapture will be counted as part of the Church.