My baby girl has her days and nights mixed up. She’ll sleep 3-4 hour stretches during the day but maybe max an hour a night. She still spends most of her night sleeping but wakes up constantly. She’s only 3 days old so my hubby and I have just been in survival mode and have been taking shifts at night being with her so the other can get a bit of sleep. I’m wondering at how old is appropriate to start trying to teach her day and night (if that makes sense).