hi and welcome, the kitten is just missing mommy and soothing himself much like a toddler with a soother. he perhaps was taken from mommy too soon.(?)
Its nothing to worry over, when the older cat has had enough of this attention he will put a stop to it or the kitten will grow out of it....otherwise its actually quite common...♥
Sounds like my cats.
My Napoleon female(KittyGirl) had kittens with my male Himalayan (Mr. Bumbles). She wasn't a good mother cat and Mr. Bumbles seemed to loved playing the role of mother.
Here it is 5 years later, we ended up keeping a couple of the kittens...one was a Napoleon and we wanted him, the other was a Non-Standard Napoleon (Giant kitty). My little guy died a couple years ago because of a blockage, but the (giant kitty) named MonkKitty is close to the same age as his dad Mr. Bumbles (about 5 yrs old) and he still thinks of Mr. Bumbles as MOM.
Bum gets tired of Monk from time to time and lets him know, but they seem to comfort each other.
Both have been fixed for a very long time but Mr. Bumbles loves baby kittens. He would have made a good mother cat.
Even Mr. Bumbles will sometimes use a "blankie" and act like he's a kitten nursing.
Doesn't sound normal to me, but if it soothes them, then I guess it's not a problem.
Years ago my cat Ashes, God rest her soul, had babies. We kept one, Sox, God rest his soul, when Ashes stopped nursing him he went to my male cat, Milo, God rest his soul. He sucked on Milo for years. My family always called Milo his wet nurse.
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