10 day old kittens help please!

The three adorable kittens my kitty Bella had are getting big and they have just opened thier eyes. I am a little worried about the smallest one because the umbillical cord has not fallen off yet. It is all dried up and looks okay, just still there hanging by a thread. The other 2 had thiers fall off days ago. He is eating good and seems healthy and it doesn't look infected. Should I be worried? I will post a picture although it isn't very clear because momma didn't want me taking him away.

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The center looks like a round raised circle with a tiny hair like string coming out.

It will drop off in the next few days, I dont think you have anything to worry about don't pull on it as you could cause her to have an umbillical hernia. It should drop off in the next few days, I have kittens that are 13 days old and only now has the last girl started to open her eyes sometimes these things take time xx

Don't worry, it's completly normal It usually falls off between day 2-6- I'd only worry if it looks infected...