Eyes open?  That would make them 5 weeks or more.
 
Should be little potbellies at this point but the weight sounds too low.
Don't have a scale or I'd weigh my kits right now.  Would suspect 5 weekers
to be about double that weight but this is a pure guess.  Weight varies
extremely from litter to litter until they reach mush more adult ages.
 
bill and diane killian
zen and the art of ferrets
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http://www.zenferret.com/
[Posted in FML issue 1603]