I recommend discussing the issue with your primary care doctor
, especially if the symptoms are persistent. I would also definitely consider going back to the running store that sold you these shoes! The most likely cause of numbness
or tingling in the toes is compression from a pair of shoes that is too tight. The shoes may fit nicely everywhere else but could still be too tight in the toes, which might be leading to your problem. Most professional athletic shoe stores will be able to help you properly size a pair of running shoes to prevent this sort of problem in the future.
However, it is important to discuss this issue with your primary care doctor. Although it is likely that simply switching to a different, roomier pair of shoes will probably solve the problem, your doctor will be able to examine your feet to make sure there is no sign of a more serious problem. For example, although rarely in someone as healthy as yourself, new onset of numbness in the toes might be a sign of a general medical condition causes damage to the nerves in your feet or evidence of impaired circulation in the feet and legs. Again, I doubt that this is going on, but is a good thing to bring to the attention of your doctor.