There are two great pillows that you need to have to prevent the baby's flathead in the strollers as well as in the bed. 1- The first one is the Kuteby Memory Foam Pillow (Baby Breathable Shaping Pillow - Memory Foam) which is a must-have for all babies due to the reasons listed below and the reasonable price and the great limited discount that they have: Prevents flat head syndrome Relieves tension on the baby's head Allows the baby's neck and spine to be aligned more easily. Soft, breathable fabric Hypoallergenic and anti-bacterial It is also available in 3 different colors 💙💞💛 Pillow Case Cleaning & Care: Use regular detergent without fabric softener or bleach Handwash only Air Dry 2- the second one which is not an alternative is very necessary is the Kuteby Baby Cushy XU travel pillow which is awesome and great to use in the carrier, stroller, and even at home, which elevates the baby's head and avoids flat-headed syndrome to be happening. There are some info that I can share with you regarding this: Very cheap price Great article Nice and lovely design Great reviews from the customers And there are also some more details about the product that I can share with you here: Travel without worry- Prevent the possibilities of head injuries and spinal deformation by keeping your baby in an optimal resting position! Sleep soundly- Don’t let the bumpy road wake your babies from their slumber, in CushyU’s embrace nothing will bother their heads! Embraced by softness- Light, soft, and super comfy, CushyU is the perfect place for your kids to lay their heads on! CushyU is the ultimate choice- Your baby’s safety should always come first, CushyU creates a safe, comfy, and optimal position to ensure the wellbeing of your child!