Is any 2 month old really 'sleeping through the night', or is that a relatives' story?

Every visitor asks if she sleeps through the night. Two have told me their babies did at six weeks. One said 'from the first day'. Ours wakes every two to three hours, feeds, and goes back down. Our doctor is happy with her weight. I'm not worried, I'm tired, and I'd like a real number. What did your babies do at two months, and what did 'through the night' mean in your house? Does five hours count?