The pillow is suitable for children as young as three months, until they are toddlers. This is a head shaping pillow. Does it help to round a flat head? Yes, the pillow corrects the cosmetic flat spots caused by oblique or short head malformations, often called "flat head syndrome," and supports babies born with torticollis. Where can I use it? Pillows are recommended for flat areas such as floors, but can be used in cribs, bassinets, bouncer seats, swings, strollers, or car seats.