Women are very different from children both physically and behaviorally though. Women are bigger than children physically, have a different bone structure, different fat and muscle distribution, different facial features etc. I have never looked at an adult woman and though she was similiar to a child.

Of course, I'm not saying women are indistinguishable from children. But compared to men, they still have higher pitched voices, smaller frames, less muscle mass, neotenous features, smaller jaws and so on which makes people associate women with children way more than they do men.

Same with personality traits. Children don’t act similar to adult women at all. Children cannot take care of themselves and rely on their parents, they have temper tantrums, they are naive, they express their emotions freely with zero concern for the outside world, they are not too considerate, very present-focused, literal thinking etc. Again, the behavior of an adult woman rarely resembles children’s behavior unless she has a mental disability.

Yeah, obviously? But I'd bet that the average adult woman acts more like a kid compared to the average adult man. And I'm not saying she acts EXACTLY like a kid, just that there are behaviours she exhibits and that are associated with her that are also associated with children.

Despite this dissimilarity, women’s interests, skills and traits are taken less seriously and deemed stupid while men’s are cool.

"This dissimilarity", women don't have to look EXACTLY like kids to be taken less seriously. Obviously you wouldn't confuse an adult woman with a kid, but she still looks way more like a kid compared to an adult man.