I used to do the same as you, they would wake up around 7ish and then go down for their morning nap a couple of hours later; dear me, why would anybody want to start their day at that time if they don't have to!
Hi my ds usually wakes up at around 6am too, I wish he would go back to sleep for an hour or two. It's so tiring having to get up at that time. I have to take him downstairs so he doesn't wake his brother up (5yrs and in school full time) as I don't think it's fair to wake him up that early. Jealous
Anything before 7 am is NOT a civilized getting-up time! If DS (almost five months) wakes up even at 6:50, I put him back to bed or at least try to. Usually, his early morning feed - or I prefer to think of it as "the second night feed" - is at 5 am. He usually goes back down until 7:30.
Agree with WorrisomeHeart - just enjoy it! DD used to go back down after her 5/6am feed until she was about 8 months as well, then suddenly decided she didn't want to anymore... luckily after a few months of very early starts, she now usually sleeps right through until 7am.