Well, in the US at least, it was after the war was over, not during it.

Is the war in Ukraine over yet? The baby boom happened after World War II, not during.

Ukraine has conscription for over 25s so that they can have children before going to the war.

it would happen after the war is over.

Baby Boomers are the folks born from 1946 to 1964.

The war is the cause, but it has to end to do it.