DS didn't sleep longer than 4 hours at a time until he was 12 months old. Since then, he has slept 12-14 hours a night pretty consistently.
DD has had 5 nights in her 6 weeks of life where she's slept over 7 hours.... she normally goes at least 6 hours per night though and has done so since she was only a few days old.
2 completely different kids they are.