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Saliva reflects the plasma free fraction of testosterone which is biologically active, and available for uptake by tissues. Testosterone concentration in saliva, though differing slightly from the concentration of unbound testosterone in serum, is in good correlation with the latter, indicating that salivary testosterone provides a reliable method for determination of serum free testosterone. The study aimed to investigate salivary testosterone levels and their changes in preadolescent children and to study sexual dimorphism. Testosterone levels were determined in healthy preadolescent children 77 girls and boys from saliva samples by radioimmunoassay. Sampling was performed once a year with respect to circadian and seasonal fluctuations of testosterone.
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Salivary testosterone levels in preadolescent children

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Is 8 Years Old the New Age of a Tween? Here's What Parents Should Know | Parents

Your child likely has heard about this too. Still, the changes that occur during puberty can be quite a transition for everyone. So it pays to understand what growth typically looks like for boys and girls during puberty. So today we are focusing not just on growth during puberty, but helping families look at it in a positive light.
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Is 8 Years Old the New Age of a Tween? Here's What Parents Should Know

Legos and lip gloss. Jungle gyms and Justin Bieber. In the course of an hour, your kid has crawled onto your lap for a snuggle, rolled her eyes and sighed at the last three things you've said, played dress-up with her dolls, and tried to convince you that it's okay for her to start wearing mascara. It may seem like just yesterday that she was taking off the training wheels, losing her first tooth, and learning her ABCs, but in today's warp-speed world she's somehow teetering on the cusp of her 'tween years. The term 'tween used to mean kids just shy of their actual teens — that is, to year-olds.
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You might gain some weight, just as you have done every year since you were a baby. You will also find changes happening to your body hair, your genitals and your breasts. All of it is perfectly normal. If you want to know what girls go through, have a look at puberty — things that change for girls.
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