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  2. Gesell Developmental Schedules - Wikipedia

    en.wikipedia.org/wiki/Gesell_Developmental_Schedules

    A child's performance on each strand corresponds to a Performance Level Rating (Age Appropriate, Emerging or Concern) and a Developmental Age. Developmental Age, determined by calculating the results of the GDO-R, is an age in years and half-years that best describes a child's behavior and performance on a developmental scale.

  3. Child development stages - Wikipedia

    en.wikipedia.org/wiki/Child_development_stages

    Typically grows at a similar rate to the previous month, usually growing between 1 and 1.5 inches (2.5 and 3.8 cm) and gaining about 2 pounds (910 g). [23] Resting heart rate is usually between 80 and 160 beats per minute, and it typically stays within that range until the infant is about one year old. [18] Motor development

  4. 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 ...

  5. Puberty - Wikipedia

    en.wikipedia.org/wiki/Puberty

    Maximal adult height is achieved at an average age of 15 years for an average female and 18 years for an average male. Potential fertility (sometimes termed nubility) usually precedes completion of growth by 1–2 years in females and 3–4 years in males. Stage 5 typically represents maximal gonadal growth and adult hormone levels. [citation ...

  6. Development of the human body - Wikipedia

    en.wikipedia.org/wiki/Development_of_the_human_body

    Until the maturation of their reproductive capabilities, the pre-pubertal physical differences between boys and girls are the external sex organs. On average, girls begin puberty around ages 10–11 and end puberty around 15–17; boys begin around ages 11–12 and end around 16–17.

  7. Adolescence - Wikipedia

    en.wikipedia.org/wiki/Adolescence

    For boys, puberty typically takes around 5 years to finish, as opposed to just 3 + 1 ⁄ 2 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.

  8. My teens are 2 years apart, and I always thought they'd be ...

    www.aol.com/news/teens-2-years-apart-always...

    They are so different. Now, at 13 and 15, my boys are vastly different from each other. One is an introverted gamer who thrives on routine, and the other is an extroverted adventurer who craves ...

  9. Child development - Wikipedia

    en.wikipedia.org/wiki/Child_development

    Between 1–2 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 ...