What's wrong with a baby who is only a few days old not sleeping after drinking milk at night?

Patient's question:

A baby just over ten days old, after drinking milk at night, doesn't take a nap and cries for several hours before finally falling asleep weakly. Two hours later, he wakes up again. During the day, he also doesn't sleep much, averaging a feeding every two hours. After eating, he stays awake and doesn't sleep. When put to bed, he hums and tosses about, unable to sleep peacefully. Is this because the child is uncomfortable? Drinking milk is normal, and he has bowel movements, sometimes having more than one bowel movement a day...

Doctor's answer:

Baby is almost two weeks old? Has it been fifteen days already? If the baby is drinking milk, urinating, and defecating normally (meaning there are no sudden changes from usual), newborns (babies under one month old) generally need about 20 hours of sleep per day. They spend most of their time eating, drinking, urinating, defecating, and napping. However, their deep sleep is not on a regular schedule. They will nap when they are full and comfortable.
If the baby is fifteen days old, it’s time to start supplementing with vitamin D, which is vitamin D drops (AD drops). It’s also important to get more sunlight exposure. Ideally, the baby should spend two hours outdoors every day. If the weather is bad, you’ll have to endure taking the AD drops, because vitamin D deficiency can lead to rickets, which, in the eyes of the public, manifests as a baby who seems otherwise normal but doesn’t nap, is easily woken up, and is easily startled.
I hope this response helps you.

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