Upseat Baby Floor Seat and Booster with Tray

Baby seat which you can also use as a booster seat. It's designed to keep the baby's hips in the right position when they're small. Cost €120. Here's their blurb;

The Upseat Ergonomic Baby Floor and Booster Seat was developed with the guidance of leading physical therapists to encourage proper upright posture and to be safe for your baby’s developing hips.

→ Developed by Experts: Developed with the help of leading physical therapists, the Upseat engages the muscles responsible for proper upright posture and safely splays your baby’s hips in a development-friendly position.

→ 3-in-1 Design: The Upseat is versatile and can be used as a floor seat for sitting up, a booster seat using the handy conversion straps, or a feeding seat with an attachable tray. It’s the perfect seat for playtime and feeding.