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  2. Caster board - Wikipedia

    en.wikipedia.org/wiki/Caster_board

    In 2008, Razor secured worldwide rights (outside South Korea and China) to the patent, [8] and by 2010 an industry trade journal noted that “control over the basic caster board patent helped Razor’s sales [over] competing sports products … similar in appearance and operation.” [9] Within five years of the caster board’s invention ...

  3. Child development stages - Wikipedia

    en.wikipedia.org/wiki/Child_development_stages

    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. Can hold up head and chest while in prone position. [24] Movements of arms and legs become smoother. [25] Can hold head steady while in sitting position. [24]

  4. Child development - Wikipedia

    en.wikipedia.org/wiki/Child_development

    Some age-related development periods with defined intervals include: newborn (ages 0 – 2 months); infant (ages 3 – 11 months); toddler (ages 1 – 2 years); preschooler (ages 3 – 4 years); school-aged child (ages 5 – 12 years); teens (ages 13 – 19 years); adolescence (ages 10 - 25 years); college age (ages 18 - 25 years).

  5. The Best Gifts and Toys for 9-Year-Old Boys

    www.aol.com/finance/best-gifts-toys-9-old...

    Combine two hobbies 9-year-old boys like into one: scootering and Nerf. The scooter shoots Nerf darts up to 60 feet and works with other Nerf accessories. Walmart

  6. Preadolescence - Wikipedia

    en.wikipedia.org/wiki/Preadolescence

    Preadolescence is a stage of human development following middle childhood and preceding adolescence. [1] It commonly ends with the beginning of puberty. [2] Preadolescence is commonly defined as ages 9–12 [3] ending with the major onset of puberty.

  7. Stress in early childhood - Wikipedia

    en.wikipedia.org/wiki/Stress_in_early_childhood

    Early childhood is a critical period in a child's life that includes ages from birth to five years old. [1] [2] Psychological stress is an inevitable part of life. Human beings can experience stress from an early age. Although stress is a factor for the average human being, it can be a positive or negative molding aspect in a young child's life ...

  8. Erikson's stages of psychosocial development - Wikipedia

    en.wikipedia.org/wiki/Erikson's_stages_of...

    Erikson's stages of psychosocial development, as articulated in the second half of the 20th century by Erik Erikson in collaboration with Joan Erikson, [1] is a comprehensive psychoanalytic theory that identifies a series of eight stages that a healthy developing individual should pass through from infancy to late adulthood.

  9. Developmental regression - Wikipedia

    en.wikipedia.org/wiki/Developmental_regression

    Developmental regression is when a child who has reached a certain developmental stage begins to lose previously acquired milestones. [1] It differs from global developmental delay in that a child experiencing developmental delay is either not reaching developmental milestones or not progressing to new developmental milestones, while a child experiencing developmental regression will lose ...