In the discussion a couple days ago about children and the rapture  it was mentioned that the children of Noah's day were not saved form the flood nor were the children of sodom and gomorrah. I think you have overlooked that the children in Noah's day were not fully human but human-fallen angel hybrids and thus were ineligible to be saved. Only Noah and his family were perfect in their generations and thus only they were fully human and only they were eligible to be saved. As for S+G we don’t have any indication that there even were children in those towns (or women for that matter save Lot's wife and daughters). Since their sin was homosexuality I would lean towards no children being in those towns since you need male AND female to create a child. If children had been there they would surely have been abused and I think that would have been mentioned.
 
Since the rapture is so soon we will know shortly if all children go. I lean in that direction as we are under Grace in this period and thus it is grace that saved us even those not yet able to make a choice on faith.
 
Paul