If the strap uses Velcro, then use your fingers to pull apart the Velcro.
If the strap uses Velcro to secure itself, then make sure the Velcro is facing away from the nipple.
If the strap uses Velcro, press the Velcro together to secure the strap.
The loop is often made from a thick material, such as leather, cord, or canvas.
The strap may be a flat ribbon, or it might have beads or other decorative items on it. However, it should still fit through the loop easily.
The clip is probably too strong for your child to undo, but it’s still a good idea to attach it somewhere they won’t be as tempted to mess with it.