No, increasing the size of an object will not necessarily make it heavier. The weight of an object is determined by its mass, which is the amount of matter it contains. Increasing the size of an object will increase its volume, but not necessarily its mass. If the size increase is accompanied by an increase in mass, then the object will become heavier.
Similarly, reducing the weight of an object will not necessarily make it lighter. Weight is a force that results from the interaction of an object with a gravitational field. To reduce the weight of an object, one would have to reduce its mass, which would require removing matter from the object. Decreasing the size of an object will reduce its volume, but not necessarily its mass or weight.
