When I start teaching 6-7 yer olds, I don't bother with the stave, as that is introducing a new set of symbols that are generally way over the averge child's head! (Imagine - that AND learning to read and do maths - what can it all mean?!)
This is the method I've been using over the last 12 years. It's very cheap, as you don't need a book, but the child's fingers MUST reach all holes on the recorder.
I start by explaining that all instruments play the 'same' notes. If you have any other instruments at home, play an 'A' on all of them. The children are always really surprised by this, and it gives them a sense of belonging to a big musical family.
Then, we learn BAG, because they'll be able to blow them without a squeak, adn we do all sorts of exercises blowing these notes in different orders, getting the fingers moving around without having to look what we're doing!
THEN, contrary to all tutor books, we learn low notes such as C,D. This is to make sure the children are blowing softly enough, and brings their right hand into play. When they've mastered the blowing technique and can blow low notes without a squeak, we'll learn something like 'Hot Cross Buns' or 'Mary had a little lamb'. We clap and sing, and I give the notes as BAG BAG GGGGAAAA BAG (for instance - no stave) Within about 15 weeks, I find that the children can manage something like 'London's Burning', which ranges from low D to high D.
I find that this method reaches less able children as well as the more able (who are generally more mentally equipped to learn new symbols), and, because they aren't initially put off by mysterious notes and symbols, many more children carry on coming to lessons in later years. They move on to learn notes and time signatures, etc in Y3, and many take up an extra wind instrument.
I generally use a tenor recorder to play with the children, as this gives them a magnified view of what they should be doing!