This is a fun little game to play with your infant. I don't remember where I saw it, but Emily loved it when she was a baby and I tried it again with Juliette and her face lit up and she gave me the biggest smiles while I was doing it.
All you need is an empty paper towel tube and your voice!
I placed the paper towel tube near Juliette's ear and whispered "I love You" to her. Then I switched sides and whispered something else. The sound really amplifies so all you need to do is whisper.
This little game helps develop auditory skills and at the same time it fascinated both Juliette and Emily!