icky sicky (TMI)

Yes I put "TMI" in the topic to warn you I'm gonna use the word... mucous.   Eeeeew.  Now I don't think many things are TMI, but I just really don't like that word! 

So Ella is a spiller.  She spills after every feed, and not just after them either, she likes to spill her way through the day, and we go through a LOT of bibs.  Of course, sometimes it's the plain milk spill - nothing gross.  Other times it's lovely (not) curdled milk, and some of the time it just smells like vomit.  Some of her spews are mucousy - the curdley ones.  What I don't get, is how she has mucous in her belly when she's not sick!!  Where on earth does it come from?  Also... and again, TMI - her poo's have become a bit mucousy too.  Is this normal for a fully breastfed 15-week old?  Apart from Eczema she's absolutely fine, so I really don't think she's ill.  But it puzzles me.  And it's not stringey-like milk coming up either (I express once a day and the milk's pretty normal-looking)... she spilled/vomited over my lovely satin gown (again) this morning and I hate to say it but that gave me a really good looksey at just what was coming out.  Not pretty!