Use a full set of dominoes with the older child. Before playing review each dot pattern with the child, as the numbers seven through twelve aren’t as easily recognized.
Before playing the game, review each domino dot pattern with the child. Only include dominoes that have the numbers zero through four represented on them. As a general rule, children can subitize (or give the total without counting) up to their age. So if playing the game with a three year old, only use dominoes zero through three.