My son was first using the upseat so it's like the attachment to the chair you already have and the one for when he was like 6 months to 18 months and it has its own little tray but my boyfriend stuck it in the dishwasher and it came out folded so then we moved him to the one that is 18 months to 36 months I believe but that one didn't have its own tray and it just was in the same height as the table so then I decided to get him his own little table but I feel like he gets easily distracted there and he gets up and starts to wander sometimes