What’s the short story “Lullaby” by Elizabeth Berridge about?

Lullaby is a horrifying story about a couple, to be more precise, a woman married to a selfish soldier or man of war whose only interests were for his own benefits without caring for others. The woman is a dependent and submissive wife, who tries to please her husband no matter what. They had a baby and as a young couple they wished to still go out together. A friend of the man gave them a recording box, which later they used to record the mother’s voice, taking advantage of how obedient and innocent was the baby they would go out and leave the recording for the baby to be calm and fall asleep. One day, the couple decided to go a little farther than usual, so as usual too, they turned on the recording and left the baby alone at home. As there was something wrong with the blackout curtains and the wind was very furious that day, something happened with the curtains and the candle holder so the room started to get burn. At the end, the author finishes the story with the parents realizing something was wrong following their instincts, they called a taxi and left. The suspense of not knowing what happened to the baby made this story even more horrifying.