How Long For Baby Kitten To Be Attached To Umbilical Cord?

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I’m not sure how long for my kitten to be attached to the umbilical cord. He is 12 days old and when I took him out of his mother he was moving around, but then a few minutes later it stopped suddenly and started growing more slowly until now he’s just a small dot. Should I worry about this?

Asked by Cat on Tagged in Baby