Has the mommy ever raised babies before?
Did the baby who passed away have any hair?
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From my own experience with Banana (who never raised one)
she could reject both or on different days... sometimes a week apart... bottom line KEEP CLOSE. don't over check just stay close enough to listen to what is going on. I would work on a rejected joey kit ASAP check out Suz's
www.suzsugargliders.com/handraisingajoey.htm
it is a great resource.
I wish you luck, keep us posted.