Good grief, I'm so slack I didn't realise how many 'rules' I'd broken!
We didn't go to any baby classes - but mostly because I'm lazy/broke rather than on principle.
I've never warmed milk - DD was born in hottest summer for years & seemed to like it chilled (that's what I'm telling myself, anyway).
I breast fed occasionally after a glass or two of wine - although I'd usually try to express beforehand instead as I'd be sleepy enough b/feeding without adding booze!
I stopped sterilising as soon as DD became mobile - if she can cope with licking the wheels on her pushchair, she can cope with a clean-but-not-sterile spoon.
Eating just-dropped food off the floor is ok - as long as it's my floor.
I use 'no' all the time - oops, didn't realise you weren't supposed to!
We definitely didn't follow a strict timetable - I know some mums swear by that sort of routine but I'd have gone mad. The only routine I imposed was a bath-milk-story-bedtime pattern, the rest she's set for herself (and is now nicely predictable but thankfully can also be varied without tantrums).
And no, I don't always brush her teeth after the milk. Though 'brush' is a bit of a misnomer anyway given that (like other mums here have already said) it's more like suck-toothpaste-off-brush-then-chew!