If the baby was a girl, she would be immediately returned to her mother, but if it was a boy, there is a possibility that the sparing of the boy's life would invite a disaster in the future even though the baby was still in baby clothes, and that was why it had already been decided that the baby boy would be killed as a baby.
その子が女子ならばすみやかに母に返されるが、男子であれば今は産着の中にあっても、将来に禍根を残す恐れがあるので、赤子のうちに命を絶つように決まっていた。