I can’t know this for sure of course but I have had 3 babies now and they were all born angry. Their first couple of weeks they really seem quite angry!
If they are not, they should be! They were in the perfect environment and were taken out. Now they have to eat, deal with gravity, breathe, deal with heat and cold etc.
Every time I’m frustrated with my baby; I just think of that. She recently noticed that she has to breathe every 3 seconds or she will DIE! Coming from your mother’s womb that would sound so ridiculous that you would probably think they were joking.