It's a cold.
I've had a sore throat all day, which is a sure sign; what confused me was that normally I get the sore throat before I start sneezing my head off.
Anyway, I must've passed it on to Baby because she's still really snuffly too. It'll be her first real cold. (In fact, its my first cold too, since before she was born.)
We've had the steam vaporisor on in her room, for the last couple of nights (as well as the heater), and from tonight I'm putting a little Vicks VapoSteam in the water too. Tonight the snottiness was so bad that I couldn't even give her a comfort feed when she was having trouble getting to sleep, because her teeny nasal passages were so congested. We both gave her big, long cuddles and - third time lucky - finally she fell asleep to the boy's deep voice.
It must be nice to be able to send a child to sleep just by talking to them.