#3 Use a firm tone

Next, use a firm tone the first time you issue an instruction.  Children, a little like your pet dog, don’t necessarily listen to the words but instead judge by the tone.  A nice but firm tone with the first instruction given and they might well respond without much prompting. If you match this by getting their attention by moving into their space or making sure you have eye contact is another way of making sure they register the importance of your instruction.