Ethan's "Baby"

When Ethan was just a wee one his mama would say things to him like "No, Baby. Don't touch" and "It's time to go, Baby" etc. Ethan picked up the endearment and started returning the favor by calling his mama "Baby". So now this three year old says to his mama  "It's time to go, Baby" etc. I think it is cute but his Grand Papa Jason says at what age does it become just weird. Maybe in his teens?