Help with glove

I am knitting a pair of gloves for my son. When I knitted the body of the glove it was the right size, but now that I am knitting the fingers it is stretching. What can I do to reduce it back to the size that I need? Will washing and blocking it do that?

How is the body stretching while working on the fingers, and is it the whole thing, or just up by the fingers? Are you doing the fingers on dpns?