There's a reason for that: human newborns are, by other mammals' standards, always born premature, even when carried to term.
With most other mammals, their newborns are developed enough to at least be able to move around on their own, albeit slowly in some cases. Hell, look at basically any bovine, equine, or other ungulate species and they're outright running around immediately after birth.
When humans evolved and we started to stand upright and our skulls got larger, one key thing didn't change to compensate: the birth canal. Human beings are already like the only mammal that has this much struggle actually giving birth in the first place, but even then, sacrifices had to be made, and as a result the skull of a human baby isn't fully formed yet when they're born.
And that's just one example of human newborns being, on average, less developed. Look at the difference in appearance between a newborn baby and one that's about six to eight months old. That's roughly how developed most other mammals are at birth, to show how much humans lag behind.
Essentially in any other animal it would be a crucial evolutionary flaw, but because humans are the world's most advanced apex predator and over all dominant species, some concessions were able to be made.
So yeah that's basically the major reason why human newborns are so damn ugly compared to other baby mammals.
