DD at 6 weeks was only staying up for about an hour in total, including the feed, change, etc.

Whenever we saw her yawn (her first obvious tired sign), we'd put her down straight away. This worked heaps better than earlier, when we were more confused about it, and kept letting her get overtired.

So our daytime routine was always:

wake
feed
change/bath (if needed)
play until first yawn (most playing involved making faces at each other, and talking to each other, stuff like that).
bed

In the night, I just fed her, changed her, and put her down again. Not that she always went straight to sleep, not by a long way. But I didn't want to encourage her to play at night, so tried to be as boring as possible.