Sometimes we forget that young children need more time to adapt to new situations than we do. If you have several toddlers during a babysitting shift, remember to give them advance notice 10 minutes prior to a transition, and you will find that your babysitting shift goes smoother.
For example, if you're planning on taking the children outside for a walk, make an announcement ten minutes before you plan on leaving: "We're going to be going for a walk outside in 10 minutes. It's so nice outside!" Let the children continue to play, and then mention the walk again a couple of minutes before the walk: "It's almost time for our walk, so let's put these toys away and get our shoes on."
Remember to give the kids in your care advance notice, and everyone will be happier and calmer.