We have a 5m old; 18lbs. My husband easily put this together after bedtime one night and we put our son in it the next morning. He instantly began playing with the toys, laughing, and hitting the buttons on the music box. He LOVES it! He figured out how to scoot himself backwards pretty quickly and is already starting to move forward; barely though. Just on his tippy toes. The height is very easy to adjust, and the toys are entertaining. It helps our morning routine to put him in it while we get bottles, breakfast and coffee's to-go. He entertains himself; talking, laughing, grabbing, and scooting. I 100% recommend this walker!