I use Aspen. Just like we betta owners like when people research a betta before they buy it, I do the same for any other animal. ;)
There was a lot of research done before buying this hamster, believe you me.
Pine and Cedar are very harmful. Aspen is the best, and lucky me, Canada is one of the few countries that sell it. The other types made of recycled paper etc are very expensive and it seems like my little girl likes digging in the wood shavings a lot anyway.
It's been 15 days since the little ones were born. Unfortunately the runt passed, but I knew that was coming. It was only half the size of the other babies and had a huge lump on it's back that was very abnormal. So now I have 6 little ones left. One the same color as the mother, and 5 that are sable. (a darker brown.)
They just opened their eyes the other day and I finally got to clean the cage yesterday (it was almost unbearable LOL).
Here's a pic of one!