This jumper is the best. It keeps my son entertained for long enough to make dinner or take a shower. Assembly was a breeze. I didn't even read the directions...it was very intuitive and took me less than five minutes to assemble. My favorite part is how easily the height adjusts. My 1 year old is very tall and way too big for his exersaucer, but fits in this jumper perfectly (the exersaucer is nearly impossible to adjust height). He jumps in it, dances in it, and loves the toys. He will probably fit in it for 2-3 more months, and then we will put away for our next baby. I think at the lowest level, it would work for a baby as young as 4 months, making it a great value since they can use it for so long.