i had read the ebook "how to multiply your baby's intelligence if my memory serves me right, the book says retire the word after you show it 15 times to a child, so if you show a word 3 times a day, then after five days you must retire that word. So first day you have one set of 5 words, second day you add another set of 5 words. the book recommends adding  up to 5 sets in all. so from the first day you start to the 5th day of the learning program you will retire 5 words a day and add 5 new words after the fifth day, so preparation of material does come in handy youll never know when you will run out of words, hope this helps you

thanks this was really helpful ..

thanks a lot for this ebook been going crazy this past few weeks in finding a decent book about teaching babies thanks