Maggie is weird... she will sleep for long periods if someone is holding her or lying beside her - but if she is put down, she pretty much instantly wakes up and stays up. So we've settled her into a schedule via babywearing and co-sleeping.
She is up most of the morning (7:30am - noon) and then down in the sling or Snugli for the rest of the afternoon, with a few waking periods for quick feeds. She's up again by dinner and stays up another couple hours, then sleeps through the evening in her bassinet. Around 10:30-ish she wakes up again and I take her to my bedroom for "quiet" awake time - singing and reading - rather than the excitement and playing of her morning stretch. She passes out at bedtime (anywhere between 10pm-1am) and then "sleeps" until 7am the next morning. She wakes up during the night, but doesn't cry or even open her eyes... she just grunts a bit, rolls over for a side-lying nurse, and goes back to sleep.
So we have some good sleep stretches, but also some *amazing* awake periods where she is up, alert and just wanting to play and explore.
She can already hold her head up and steady for stretches of time during "tummy time" and she has learned a lot of new vocalizations, mostly directed at her daddy while he makes funny faces with her.
I really, REALLY hope she keeps this schedule (or something like it!) It is SO convenient.