Thank you so much for you advice and input!  I can't watch to watch the link

Hi.  I just downloaded all the free printable flash cards.  I've printed out and have been doing the Animal1 card pack with my 15 month old.  I know that they are supposed to be done fast, (and I've been implementing sound effects) but other than that I don't know much about them.  When do I start to add in more animals to my pile?  Or do I keep piles of 5 and switch them out routinely?  How do you introduce new words.   Is it okay to have multiple categories going on at the same time?  Like, do animal cards in the morning, and parts of the body in the afternoon?  Or should I keep it all animals until he has mastered them?  Any help would be greatly appreciated!!