My best suggestion at this point since you are really unable to care for this baby is to contact your local humane shelter or vets office and explain the situation to them. Both usually have someone either on staff or that they are familiar with that is experienced in caring for orphans such as this. Caring for a newborn kitten takes a huge amount of time and dedication and if you are not experienced in raising orphans it can be very difficult.
I hope this helps. Please let me know if you need further info.
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