Interesting series! The mantis in the third photo is an adult as it has wings. Both the nymph (baby) and the adult look to be Chinese Mantids, Tenodera sinensis.
Here is a link to compare your Mantids:
http://bugguide.net/node/view/10098
This would be a good spotting for the Marvelous Mantids of the North East mission: http://www.projectnoah.org/missions/15738247
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