The kitten is too large now for comfort, and Mrs Weaver is worrying about what happens if summer comes, as layers of protective clothing for claws to attach into will diminish until in the end bare skin just waits for attack.
The other kitten, Somhairle, does not do this.
I have never ever seen an animal do this. They are so ridiculously soppy, wanting to be carried round all the time. Being picked up causes a storm of very very loud purring that is clearly audible across the room.