This is very normal. Babies feel insecure and defensive because they are so little. I have a 2010 male baby that hisses at me all the time. Usually they will out grow this behavior.
I agree, all I will add is try not to handle them much until there first shed. Just let them chill for a while.
Once they have shef and had there first meal then I would start working on hand taming
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Jon
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