Searching for the bell

To play the developing game you'll need only a small bell!
Show your little one  the bell and let him/her hear the bell tinkling.
Then place the bell out of your baby's sight and tinkle again. Your little one will probably look for it!
Repeat the same actions with a rattle and rubber toys that can squeak.
Make photos of your baby with the bell and toys, upload to the App. Write whether he/she starts looking for the hidden toys, hearing the sound they make.