Born dead?

[felis]

Hi
I have C. Hoehnelii. One of the females have given birth to stillborn babies. The other females have given birth to live young. I have also C. Thamnobates and one of the females have given birth to stillborn babies.
What could be the problem?
All the females live in similar environments.
Regards / Bosse

 

[kinyonga]

How long have you had them? Are they CB or WC?