Wrong Number, Lady
Most people would politely inform the texter or caller that they got the wrong number. This person, however, decided that this would be the perfect opportunity to pull off a playful prank. This woman asked her “husband” to call her after getting home and putting the baby to bed. To this, the OP responded, while masquerading as her husband, “I thought you had the baby.”
Don’t worry, guys, new mothers absolutely appreciate it when you play pranks like this on them. It’s not like they’ll immediately call the cops because the person they thought was their husband told them indirectly that their baby is missing!