It's a sign a boy is growing up and the body is preparing for the day in the future when a man might decide to be a father. Or perhaps your friend keeps talking about this one girl he thinks is so pretty. As a result, you're starting to have more feelings. It's a doctor's job to help you take care of your body — even that part. Sweat by itself is not really smelly, but when it comes in contact with the bacteria on your skin which everyone has it becomes smelly. It depends on your age, sexual maturity, level of activity, and even the amount of sleep you get. Gender is generally thought of as a stable trait:
And if your mom and dad are kind of short, you may be short, too.
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We often tend to think about gender as the biological differences between men and women. The biological sex of babies may not determine their gender later. More on this topic for: Your donation helps deliver fact-based journalism. It depends on your age, sexual maturity, level of activity, and even the amount of sleep you get. How can I talk to my mom about guy stuff? So, how do children come to understand gender?