eBay

Infant Full Body Support: This infant carset insert with thick padding will support your baby's head and back well, keeping your little one comfortable in the stroller, pram, and bouncer.
Two-Sided Use: This baby car seat insert has charming patterns on one side to decorate your stroller and raised dots on the other side to help soothe your baby. Both sides are made of soft Minky fabric, making your baby feel comfortable.
Multi-Function Cushion: This baby car seat head support works with 3-point and 5-point harness systems and can be used in strollers, baby carseat, and bouncers.
2-in-1 Design: The headrest and body support sections are attached by a soft Velcro strap that can be adjusted in height or removed as your baby grows, providing more room for your little one.
Age Recommended: The baby carseat insert cushion measures 27.5 x 17 inches and is recommended for premature babies and babies weighing up to 20 lbs.