I love browsing online image archives and have found many wonderful image libraries. I prefer to post photos with identifying information and a photographer credit, but sometimes very little or no information is available.
These images are from the National Photo Co archive. Based on information available on other photos in a series dating from 1919-1924, my guess is that the boy is the son of a foreign diplomat stationed in D.C. That's probably his mother in the first image.
1921 Left-click photo to enlarge.
Below, I think this is the same child in a photo taken 3 years later.