I made this half-moon cradle from used pallets. I have all the pallets I needed from my work, so I don't know how much pallets exactly are in it.
As always with any pallet project for a bedroom and even more for a baby or a kids, take a great care to the pallets you will use and be sure they are safe. For this, read carefully our article on pallet safety.
And, if you want to make your own pallet half-moon cradle, we have a tutorial available :)