TatianaZ's larger , date-included photo of N&A would seem definitive, but I still have trouble with that date. Do I believe my lying eyes or not?
Is it possible that the photo in question was from an earlier year, and yet entered into a 1917 album? We know the IF spent a lot of time together while in captivity going over their photos and working on albums. I find this possible , though not most probable.
As it is, I think this photo, when placed next to others known to be from the 1917 captivity (or even Jan/Feb.), would seem jarringly out of place. I can more readily see either or both N and A with a very young Alexei or Anastasia in his/her arms.