Hey fianne ~ I don't think you should still have the knot - You might need to get your GP to give it a little snip & tug it out, it doesn't hurt at all... I done it myself after 6 weeks because it was making me itchy, but i do remember them saying in hospy if it doesn't desolve it just needs a snip other wise you will end up with a permanent lump under your skin & they're not v. comfortable, i have a lil one on the inside of my belly button from another op.
I can't really help with settling I don't know why Scarlet just does it, she always has... I just make sure she's tired - then i put her in her cot, rug her up & 30 seconds later she's asleep, If she doesn't fall asleep after a few minutes i pick her back up & let her play for another 10 minutes & then try again.