By 'get up' I mean wake up for the day - as opposed to wake up, feed & go back to sleep.
Until about 12 weeks DS would go to sleep around the same time as us (between 10 & 12pm), feed during the night, but keep going back to sleep after feeds until about 9am. Which was great for me as I could get plenty of sleep, albeit broken.
A few weeks ago (he's nearly 17 weeks now) he started going to sleep for the night at around 8pm and will wake up full of beans at 6am - sometimes 5.30 . So after thinking that the first few months would be the hardest & sleep deprived, it turns out that was the easy bit, and I am now spending the day half asleep
Do they start waking up later as they get older?