I wouldn’t be sure all of them are. Our daughter (now almost 2 years old) is also a good sleeper and she tends to sleep from 9-10 PM to 7-8 AM with just a few backrubs and sips of water in between. Not something I hear from other parents for sure, but there are some really great sleeper babies out there.
That’s something I was also considering, because there were some days when she already looked a bit sleepy in the morning already. Will be thinking about it, thanks!