Quick answer

Assemble the Mompush Olli High Chair by attaching the legs and seat, then adjust the harness, tray, and footrest to fit your child. Work on a soft surface to avoid scratches, and always check that every connection is secure before use. The Olli is designed for easy setup, but taking a few minutes to fine-tune each part pays off in comfort and safety.

Before you start: tools, surface, and mindset

Unbox the Mompush Olli High Chair and lay out all parts on a clean, soft surface like a towel or carpet. This prevents scratches and makes it easier to spot each component. You won’t need extra tools for most of the assembly, but a Phillips screwdriver may help if any screws are stiff. Keep the manual handy—it has diagrams that clarify the order of steps. Set aside 15–20 minutes so you’re not rushed, especially when adjusting the harness and tray for the first time.

Step-by-step assembly and adjustment

Follow this order to avoid redoing work. Each step includes a common mistake to watch for and a checkpoint to confirm you’re ready to move on.

Assembly and adjustment steps

  1. Attach the legs to the seat: Turn the seat upside down on your soft surface. Align each leg with its corresponding socket and push firmly until you hear or feel a click. If screws are required, tighten them evenly—don’t overtighten, as this can strip the plastic. Checkpoint: Give each leg a gentle tug. It should not wobble or pull out.
  2. Install the footrest: Slide the footrest onto the front legs at the lowest setting. You’ll adjust the height later once your child is seated. Make sure the footrest is facing the correct direction—the flat surface should point toward the seat. Common mistake: Installing the footrest backwards. If it doesn’t sit flush, flip it around.
  3. Set the harness straps: Thread the shoulder straps through the slots in the backrest, then through the seat pad if you’re using one. Connect the waist straps to the crotch strap buckle. Adjust the straps so they lie flat against your child’s shoulders and hips—not twisted. Checkpoint: You should be able to slide one finger between the strap and your child’s body. Any looser and the harness won’t restrain properly.
  4. Position the tray: Snap the tray onto the armrests. Most trays have three positions: closest to the child, middle, and furthest. Start with the middle position and adjust inward as your child grows. The tray should be snug but easy to remove with one hand. Common mistake: Forcing the tray onto the armrests without aligning the grooves. If it doesn’t slide smoothly, check that both sides are level.
  5. Adjust the footrest height: Seat your child and check that their feet rest flat on the footrest with knees bent at about a 90-degree angle. If their feet dangle, raise the footrest; if their knees are too high, lower it. The goal is supported, comfortable posture. Checkpoint: Your child’s thighs should be roughly parallel to the floor, not sloping downward.
  6. Final safety check: Before every meal, confirm that the harness is snug, the tray is locked, and all legs are secure. Wipe down the tray and harness covers with a damp cloth after use to prevent buildup. Next step: Recheck the fit every few weeks as your child grows—especially the harness and footrest.

Product facts

  • Mompush Olli High Chair: Mompush Olli High Chair is designed for messy mouths and merry family time, where together begins. The Olli is built for everyday family meals, so adjusting it correctly helps you enjoy stress-free mealtimes.