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  2. Human brain development timeline - Wikipedia

    en.wikipedia.org/wiki/Human_brain_development...

    Cortical white matter increases from childhood (~9 years) to adolescence (~14 years), most notably in the frontal and parietal cortices. [8] Cortical grey matter development peaks at ~12 years of age in the frontal and parietal cortices, and 14–16 years in the temporal lobes (with the superior temporal cortex being last to mature), peaking at about roughly the same age in both sexes ...

  3. Bone age - Wikipedia

    en.wikipedia.org/wiki/Bone_age

    Images in the Greulich and Pyle atlas came from healthy white boys and girls enrolled in the Brush Foundation Study for Human Growth and Development between the years 1931 and 1942. [ 2 ] [ 5 ] To assign a bone age to the patient under review, a radiologist compares the patient's hand and wrist x-ray to images in the Greulich and Pyle atlas.

  4. Development of the human body - Wikipedia

    en.wikipedia.org/wiki/Development_of_the_human_body

    The typical age of legal majority is 18 years in most contexts, although the definition of majority may vary by legal rights and country. Human adulthood encompasses psychological adult development. Definitions of adulthood are often inconsistent and contradictory; an adolescent may be biologically an adult and display adult behavior but still ...

  5. Adolescence - Wikipedia

    en.wikipedia.org/wiki/Adolescence

    For boys, puberty typically takes around 5 years to finish, as opposed to just 3 + 12 years for girls (menarche). By this point in time, they have already experienced their growth spurt and there are evident changes in their body shape – wider hips and fat distribution is more adult-like.

  6. Puberty - Wikipedia

    en.wikipedia.org/wiki/Puberty

    Puberty is the process of physical changes through which a child's body matures into an adult body capable of sexual reproduction.It is initiated by hormonal signals from the brain to the gonads: the ovaries in a female, the testicles in a male.

  7. Child development stages - Wikipedia

    en.wikipedia.org/wiki/Child_development_stages

    By this age, infants may have doubled their birth weights. They typically grow about 0.8 inches (2.0 cm) and gain about 1 to 1.5 pounds (450 to 680 g) during this month. [28] Fat rolls ("Baby Fat") begin to appear on thighs, upper arms and neck. Motor development. May be able to roll from front to back. [29] Starts to reach and grasp for ...

  8. Voice change - Wikipedia

    en.wikipedia.org/wiki/Voice_change

    Adult pitch is reached 2–3 years later, but the voice does not stabilize until the ages of 21-25 It usually happens months or years before the development of significant facial hair. Under the influence of sex hormones (namely testosterone), the voice box, or larynx, grows in both sexes. This growth is far more prominent in males than in ...

  9. Child development - Wikipedia

    en.wikipedia.org/wiki/Child_development

    Between 12 years old, the child uses 5–20 words, says 2-word sentences, expresses their wishes by saying words like "more" or "up", and understands the word "no". [131] Between 2 and 3 years of age, the child is able to refer to themself as "me", combine nouns and verbs, use short sentences, use some simple plurals, answer "where ...