They need that security. Whackos steal babies too. I remember when my niece was born. She had to stay in the NICU for 4 months (long story). Well the NICU might be harder to get into than Fort Knox! The "door" was 2" or 3" solid glass that was framed with 6" steel and was probably nuke proof. The door locked by having 3 steel rods go from the vertical wall into the vertical side of the door, and two rods from the top, while along the bottom a 3" lip came up from the floor.
To gain access, you had to be on a list, then be visually seen thru the door and buzzed in. Once in, you passed the nurses station, then to get to the room where mom was staying, required you to walk at least 50' of hall with two turns. This led you to a double door which required you to be buzzed in. From there you went to see mom. From mom to baby in the NICU required another shorter walk and double door authorized passing.
Even if you DID get in there, without GPS you'd get freaking lost and caught!
And no, this hospital was not in some miltarized area of Russia or Germany. It was in Chicago. And no, not one of the seedier areas.
Hospitals take baby safety VERY seriously!