My male cat kneads/chews blankets. Is it normal? How to stop?

Suckling/biting and kneading a blanket can be a stress-relief response or natural soothing response in some cats. It often looks like and mimics suckling behavior seen by kittens nursing their mothers. It is possible that Kittu is feeling a bit stressed out by something (new pets, new people, new things in the home, etc), or is just doing it because it is enjoyable. If you are worried about the blanket being ruined, you can try to divert her attention with a comforting petting or brushing session, or even have some fun with a toy as a distraction instead. If Kittu seems stressed out, pheromone diffusers/collars can also help reduce stress and tension.

Sometimes this can be a sign that the kitten was weaned to early or that it is feeling stress. Kneading and sucking on fabric is a way to soothe themselves. The kneading shouldn't pose a health hazard, but the sucking can certainly lead to ingestion of too much foreign material which can lead to an intestinal obstruction. If you find that Ollie prefers one blanket or type of material, try to keep that away from him. You may want to also give him some extra one-on-one time or extra exercise in the form of play to keep him occupied. Here is a good article with a few more tips: http://www.catbehaviorassociates.com/wool-sucking/

Kittens, particularly those as young as Freddy, continue to emulate behaviors they performed on their mother's when they nursed. The kneading is the physical movement kittens must make on the teats of the queen in order to get the milk. The suckling on the blanket is the same in that they are emulating nursing behaviors. It is also possible there is something on the blanket that tastes good! There is nothing to worry about in my opinion so long as Freddy is a healthy, happy kitten otherwise.

Yes, this sounds like normal behaviors, especially given their young age. While I can’t see them to be sure, your kittens are likely soothing themselves and performing behaviors similar to what they would do while nursing from their mother.

This is quite normal behavior and I would allow him to comfort himself with the one towel as long as there are no shred which can fall off and be swallowed. Kittens will generally grow out of this behavior themselves as they settle into a new environment and mature

This is pretty normal cat behavior. They ask for attention and then get overstimulated. With an intact male cat it could also be hormonally related. I suggest you have him neutered and likely the behavior will stop.

I see that Kiki is still a young kitten. This behavior is thought to be a carryover from nursing, especially if the kitten is taken from him mother too soon. Many cats tend to outgrow the behavior by the time they are a year old. It's not bad for his health, and he should hopefully outgrow it.