This beautiful creature is a moth. And another geometer! Besides being called The Infant, it is also called the First-born Geometer. I was so sure it was a butterfly that I could add to my life list of butterfly photographs — I never saw the fuzzy antennae that moths, and not butterflies, have. But it's another notch on my geometer moth list!
The common names refer "to the adult's early emergence from a pupa in the spring." This is the only species in this genus in North America. That's cool!