The lawnmower rattles when driving forward. Not for sensitive ears.
Personally, I do not mind. I always think you have to be early enough in life quietly - if not now allowed to make noise then when?
Even the red knob (to adjust the cutting height * schmunzel *) rattles nicely.
With 1.5 years and 86 cm tall, the mower has an appropriate size for my son (but he must also grow ;-)).
The build quality is solid and well. No sharp edges.