my friends siamese cat gave birth to 2 cats and then got herself cleaned up etc and it seemed that she was all done and she had only been carrying 2 kittens. then about 5 hours later she started again and gave birth to another kitten. The kitten was very small. It survived for 4 weeks and then unfortunately died.
I hope this wont be the case with you.
Good luck.

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Kelsie