provides many free resources on their Open site; you need to register and agree not to re-sell or publish the materials but they are free to use at your church.  Read the FAQ’s here

You can find 15+ downloadable preschool worship songs from their “In the Beginning” series here.  Below their graphic, you will see “Series Elements” category and then “In the Beginning Worship Songs” with a Select button. Click the arrow next to the Select button and the individual song listings will appear.