So you have a baby who sleeps from midnight to noon.
Chances are your baby is a newborn, used to sleeping around the clock in your womb. But now this is a brand new world, with sunrises and sunsets.
It may take a while to help your baby adjust his circadian rhythm… in other words, learn to sleep at night and stay awake during the day.
But a little bit of time to get used to a new way of sleeping, and establishing good habits, I think are the only factors. First, when baby wakes up in the morning, open the blinds, say “Good morning!” as cheerfully as possible (even though you hardly slept all night) and keep active until nap time.
In a few days, your newborn will get in the swing of things!