Hello there,
Sorry to hear about your numbness. Some of the other posts already touched on the subject, but you should definitely bring it up to one of your docs. Yes, the nerves that run to the fingers are different than the other parts of your arm, but ALL nerves controlling your arm and hand/fingers start up in your cervical spine (back of neck). You have 7 vertebrae in your neck, all which protect spinal cord and nerves. At each vertebrae, a different group of nerves comes off each side, the right sided nerves of the vertebrae controls your right arm, and the left side, your left arm. Something as simple as a little pressure or pinch on the nerves that control your finger sensation could be the cause of the numbness. Different nerves affect different fingers, which is a reason why not all your fingers are numb.
This by no means suggests you have any problems with your nerves in your neck, just a possibility. I am not a doctor, just a nurse. I had swelling around my cervical spine after my AN surgery which sqooshed my nerves that control my right arm. And, as we all know, being a parent alone is enough to throw out your back, or slip a disc/pinch a nerve.....
My suggestion is to tell a doctor. The solution may be very simple. Having fingers go numb is usually not something that just happens without reason. A doctor can tell what is happening, whether it's nerve related, Raynaud's syndrome (very common), or something else.
Good luck,
Amy