You can do it as a game by saying, "Baby, let's count and put these toys into this container one one by one". You can also say, if you do this, I have a small gift for you, which could be toffee, fruits, or whatever they like. If not, you can give them marks for every good work or discipline, and end of the day, you can give a gift or a warm hug to those who receive more marks. They enjoy competing with others because there is a competition. Then they try to do it, from that way you can teach them good discipline.