Its very easy to change it and I can show you how! First, make sure you are logged into the Parents Account.
1) Go to the "GROWNUPS" bottom on the top right of the homepage to access the drop down menu and click on the "Manage Kids" button.
2) Click on the child's avatar you would like to change. You will see a red X on the top right corner of that avatar. This means you have selected this child's account to edit.
3) Then click "Choose Avatar" to change your child's profile photo. A pop-up window will appear with a selection of photos to choose from.
4) Select the new avatar you want to change to.
5) Click "Save Child Profile" to save the changes.
You have now successfully changed your child's profile picture!