Aly, I would call your vet for sure - and ask them. I think the massaging thing will do it....but if not, they must poop. Exercise may help a bit too.....I think their Mom would probably lick their...well, what can I say....the anus.....and that stimulates the process. I suspect a soft cloth on the finger might do the same thing.

Hope all runs smoothly for you.

Keep up those photos. I just love them.

And bless your soul for taking care of such tiny creatures!