Does baby need to understand the word before seeing it?
I think Doman recommends on showing familiar words first. If you started early, you might run out of those ones pretty fast. So initially I tried to attach a picture on the back of every card. It was too time consuming to create cards like that. Since our first batch of words were objects around us, I would make rounds with my baby all over the house: here is a window (and a card), here is a tree at the backyard (and a card), here is a shoe (and a card), here is a picture of a pig in your book ( and a card), here is your toy truck (and a card), etc. My son, Elliot, would touch (at first with my help), smell, feel, sometimes even lick the object… and look at the card. Again, not orthodox, but I thought it was far more enriching and fun for both of us.