First, it is wonderful that you are doing this. So, thank you.
I have a few comments.
60cm for the flash cards is in my experience/opinion way to big. That is probably the size Doman recommends, right? I followed his instructions and the cards were very cumbersome to deal with. I think YBCR flash cards are at least half that size and seem to be effective. My 2 year old reads cards that are about 8 centimeters long and does fine. I realize he is not a baby anymore, but I still think 60 cm is just too big.
LEARNING PROCESS OF INFANTS
* The Session Itself
...
3. After preparing the child, the mother presents a flash card to the child for 2 seconds and then hides it. After a few minutes she presents the same card again and so on. In presenting this card she should pronounce what is written, and also show the drawing that represents the word.
Here you might consider adding "...for no longer than 2 seconds..." as it really should be brief to not bore the child and this is a hard thing to understand when first starting out.
Also in my experience, my son was totally uninterested in the cards until I started showing the picture first, talking to him about the picture and then showing him the word briefly. I am not saying this should be a standard procedure but maybe a suggestion for something to try if the child seems uninterested.
Those are all the comments I have.
Good luck!