Flat spot correction and peaceful sleep4 month old was starting to develop a flat spot on one side of her head. Have been using this for a week at night only and already see a difference. Bonus, baby sleeps more soundly as well, before sleeping with the pillow, she would move a lot in her bassinet and end up in uncomfortable positions and wake herself up in the middle of the night because of it. I think the pillow makes her more comfortable and lets her sleep better- she no longer wakes herself up from moving so much.