KMW, very nice piece. To date your cradle, you have to date how it was constructed. How the wood was sawed, planed, mortised, etc. The thickness of the paneled sides, any variances in the shapes/sizes of the spindles, the carvings, etc. Said variances imply that each were "hand made" and not mechanically reproduced.
That was just a few "dating" hints but decided there are too many for me to easily explain, so, I found this for you, to wit:
http://www.journalofantiques.com/July02/businessjuly02.htm Or you can Google .....
dating old furniture ...... and find other web sites that explains the "dating" methods far better than I can.
After studying up on it a bit, then you should post specific questions if there is something that you don't understand about what you found.
cheers