We can create a wave function that localizes the electron to a
small region of space. However, not just to one point in space.
In doing this we increase the possible range of
momenta that the electron can have. We must talk about probabilities
for both the electron's location and its momentum.
The uncertainty in position and momentum of a wave function
results from restricting the object to a small region of space.
The wave function changes as the object moves. Because of the
initial uncertainties, our knowledge of position decreases with
time.