As the father of a six day old I can't but wonder: Is this guy totally checked out in the care of his son? How can you have a newborn baby and not be waking up at all hours of the night?
I'm a father of a 5 month old. My wife and I had an agreement in the first three months. She took the night shift. (I know she's awesome.) And I'd get up with him in the morning and keep him out of the room long enough for her to get some solid sleep. This was particularly important because we were breast feeding and had to build up a supply for daycare.
Also, I assume this guy doesn't get on email when his son wakes him up in the middle of the night. It's not what I want to do at 4 am, I don't know about you.
So there are many ways this can happen, his wife stays at home. He doesn't log when he wakes up. Whatever arrangement he has with his wife it works for him and it's not our place to judge.
I wondered that as well, actually. Lots of folks seem to be able to arrange for help but when my son was born it was just my wife and I. Our families were not able to help in any meaningful way. So we slept when the baby slept, were awake when the baby was awake, and traded care in shifts as much as possible. This fellow may be lucky and may have some additional help. In my case, I usually had the 2-6am shift.
His kid is very cute and looks quite alert! So whatever the care is I would say it's working fine for them. Didn't see any photos of the parents.
A lot of people sleep in shifts, wherein one gets a full night's sleep during what are considered "normal" sleep hours (like 10-6) and the other gets additional sleep after (10-6 with interruptions, then 6-9 uninterrupted.)
Also, some babies sleep through the night starting pretty early. Ours was maybe 4-5 weeks old when he started sleeping through the night consistently, or needing attention once during the night at most. (I sleep worse now that he's 4 1/2 years old. He gets up at 3am and wants to LARP 2048 with me. "I'm 512. You're 512. We make a 1024!!!")
So we're not allowed to call people out when they are in fact being asses. (And this was originally intended in the donkey sort of ass way, indicating rudeness.) This seems amazingly arbitrary.