I bought this bubble mower for my three-year-old son. He was so excited that he had me wedge the big box on the floor in front of his seat so he straddled it for the half-hour ride home. Of course, we assembled it the moment we arrived home.
At first, it didn't blow bubbles, it just sputtered them in the wheel with the holes. We tried it many times (took way more than twenty steps - more like two hundred) and I noticed bubbles were trying to form but then they'd pop immediately. I re-read the directions several times. Fisher-Price is a trusted company and I was sure they wouldn't manufacture a toy that really didn't perform. I was getting pretty upset and my son was very disappointed. As a last resort, I took the mower and rinsed the bubble solution out and replaced it with a different brand of bubble solution. I almost didn't do it because I thought there was no way the 'engine' could be clogged - it was brand new!
But it worked. Now my son pushes it only ten steps or so and it starts spitting out groups of bubbles just like the picture on the box. Apparently, it was the original bubble solution that caused the 'malfunction'.
The solution I switched to was the huge 100 ounce Miracle Bubbles from Wal-Mart. But, even with this, you must be careful that the mower doesn't get shaken around a lot because if the bubble solution becomes foamy it will not blow bubbles. It does seem to take normal walking around very well.
I hope this solution works for anyone else who bought this mower. It's really cute and my son loves it.