It turns out that there was complete chaos and disorder in the SS prior to the war’s end, with one hand not knowing what the other hand is doing. On the first days of November 1945, after the Germans, who were preparing to withdraw from Upper Silesia, had already destroyed the gas chambers and the crematoria, a transport of young people suddenly arrived in Auschwitz, most of them from Slovakia.
Who had decided on this odd move, why and for what purpose? After all, the Auschwitz camps were in fact no longer operational, and if the Germans wanted to kill these Jews too, why send them to Auschwitz instead of murdering them in Slovakia?
In any event, that shipment arrived and the Germans did not touch it. They put the young people in barracks where they stayed until the survivors left the camp on the night between January 17 and 18. There were no longer gas chambers, but the young Eva, who arrived there with her mother, received the Auschwitz “trademark” anyway: The number tattooed on her left arm—A-26959.
End quote from news story
Strange as it may seem, there were many child survivors of Auschwitz-Birkenau, even babes in arms. These were the children that were too young to march out of the camp when it was abandoned.

Babies being carried as child survivors march out of Auschwitz-Birkenau
One would think that the Nazis would have been better organized in their plan to exterminate the Jews. They should not have left babies and young children behind for the Soviet soldiers to find.
You can read all about the liberation of Auschwitz-Birkenau on my website at http://www.scrapbookpages.com/AuschwitzScrapbook/History/Articles/Liberation.html