Re: 2 litters at the same time....
my breeder had two litters born one day apart. they had separate areas set up, and birthed the kittens separately, but with in a few days, had moved all the kittens to one spot. they took turns caring for the kittens, regardless of who the actual mother of a particular kitten was. my boy was the runt, a tiny little thing that the breeder was worried wouldn't make it. when the kittens where a couple of weeks old, she realized that both mamas were taking turns taking kimo off on his own for some one-on-one nursing attention. he's now thriving, thanks to both of his mamas.
i think, as long as both mothers are comfortable with the situation, then there is no need to worry about it. if anyone seems stressed or anxious, then i would reevaluate.
proud mama to one kid, two dogs, three elderly ferrets, and a mischief of girly rats.
kimo kawaii- the red and white sphynx boy
sol- the fluffy "anti-kimo" rescue boy