When does a child know they are boy or girl?

My son is almost 2 and he is very much a boy. LOVES his cars! I was wondering if he knows he's a boy, and if he know the difference between boys and girls at his age. Does he like cars and boy stuff because that's how he's socialized or is it an internal instinct to do boy things?
It's about 4-5 you start seeing the "girls play with girl things only." Ten to one you do buy him a great deal of cars so he loves cars partially because you socialized him to the cars.
Gender is pretty internal, and very apparent from when they are little babies - if you watch a bunch playing together little girls do gravitate to dolls and babies and the boys to machines and things that step, they're too little to know that there should be a distinction (I'm talking about below 1 year here). Now, when they figure our their gender is later - around 2.5-3 years, they start realize they are a "boy" or a "girl", and identify their gender about then but their sex is still confusing and some recurrently think that to wear a dress and have long hair make you a girl or the opposite a boy.

I firmly believe that gender is a inborn trait fixed in the womb, but it's not wrong to reinforce that femininity with their sex if that is what they want - just distribute them opportunities to explore the overlapping traits of gender like gross motor skills (running, jump, climbing, etc...) and nurturing that often get pinned to one or the other gender. They necessitate to figure out what it means to be a boy or a girl but that there is a great deal of shared traits that are not distinct to one gender or the other.
Answers:    It is common for boys to assume gender roles and traits impulsive. Many things internally and externally encourage gender behavior. A child can clearly see the differences, boy to girl and man to woman.
Seeing mommy and daddy or even acknowledging men's restrooms and women's contained by public places.
So I believe he knows he's a boy. Even shows like Sesame Street place emphasis on femininity.
I think you are born knowing but it is also confusing to kids. My 2 year frail son is all about dinosaurs and cars. However, when I paint my nails, he offer up his little finger too. It's okay, he doesn't know. I think a lot of behaviors are instinctual but many are knowledgeable. He also like to take his pants and diapers of and chase his sister and cousin around the put money on yard with his pee-pee flapping in the turn lol. Such a man!
I think on some level they ALWAYS know. My son is "adjectives boy" too, and even when he was a little little baby he considered necessary nothing more than to hang out with the men. He have always been into cars, sports, tools, etc. It is just what he smoothly went to. He just turned three and is just presently learning the words for boy and girl and who they are associated with.

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