I would not ship before 7-8 weeks, and 15-25 grams each myself. This is my opinion that's all and what I will stick by with my dragons for the most part. Some might agree, and some may disagree, but many, many ship younger, and much smaller for their own reasons. And shipping a dragon young or before it's time gives the receiver of that dragon less of a chance at success as they may not be as skilled with such young, and small dragons, and may overlook symptoms and signs someone more experienced would catch right away and correct. Packaging them though is basically the same for them, and I will point you to a few web sites that might come in handy for you with supplies and tips.
TnC beardies packing and shipping tips with pics Copy & paste
http://www.tncbeardies.com/Packing.htm
Superior Enterprise has shipping tips as well as all you will need to ship your baby beardies. Copy and Paste.
http://www.reptilepackaging.com/tips.html
Also exoticlizards.com has some supplies for shipping and at good prices if you only need a few boxes and deli cups.
Also CheriS had a great post on how to prepare the babies for the safest trip, and making it the least stressful for them. I know she started preparing them for their trip a few days before and had a process which seemed to work great. I could not find it in the archives, but have an email to her asking for this write up or tip sheet she posted. I could not locate it on her site www.reptilerooms.com or in the archives here. Maybe someone else here has it saved or knows where to find it. Sorry I could not find cheri's as it was detailed, and the dragons she shipped out last season for the most part came out of the box eating machines, and took to a new routine rather quickly. The above sites should be a good start for you though. Good luck with the babies!!
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