By simply placing the pillow behind your babys head and pulling the bottom of the Baby Elephant Ear lobes down snugly over babies shoulders, you will give your baby superior head/neck support and encourage healthy, strong posture development. Baby Elephant Ears were designed to best support the 0-2 year old cranial-spinal developmental stages. However, Baby Elephant Ears can and should be used as long as it fits the child safely & securely. Not intended for cot use. How does Baby Elephant Ears work with my childs car seat? Baby Elephant Ears does not attach to the carseat or harness and is intended to be placed behind your babys head once she/he has been fastened securely and properly into the seat. Please refer to manufacturers instructions. Many of the warnings against aftermarket products pertain to supports and accessories that attach to the carseat in some way and could potentially alter the fit of the harness/straps or interfere with how the seat functions. According to the several car seat safety sources, a rolled towel or small blanket is suggested as a head support for your baby. We think we can do better than that with Baby Elephant Ears - safely and in style.