Our DD got a lot more "spewy" after the first few weeks (she's currently 9 weeks old). Some of her spews are just milk, some are more like curds, and much nastier smelling. Sometimes they are more like mostly saliva. I think this is all well within the normal range.

Personally, if your DD seems otherwise happy, I wouldn't worry about it. I would probably mention to the MCHN though, at the next visit, but I'd expect them to say it's nothing to worry about.