Honestly, that's a great question and I think it's best to ask your pediatrician about this one since it really depends on your baby's age, the pillow's design, and how long baby's using it, a few of us tried those pillows, and while they helped with spit-up, I always felt better getting the doctor's input on the spine concern kasi every baby is different. Your OB or pedia can check kung angkop talaga for your little one's development at tama ang positioning, so don't hesitate to bring the pillow itself to the appointment if you can!