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  2. Child development stages - Wikipedia

    en.wikipedia.org/wiki/Child_development_stages

    Physical development. 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

  3. Bayley Scales of Infant Development - Wikipedia

    en.wikipedia.org/wiki/Bayley_Scales_of_Infant...

    The Bayley Scales of Infant and Toddler Development (version 4 was released September 2019) is a standard series of measurements originally developed by psychologist Nancy Bayley used primarily to assess the development of infants and toddlers, ages 1–42 months. [1]

  4. Early childhood development - Wikipedia

    en.wikipedia.org/wiki/Early_Childhood_Development

    Early childhood development is the period of rapid physical, psychological and social growth and change that begins before birth and extends into early childhood. [1] While early childhood is not well defined, one source asserts that the early years begin in utero and last until 3 years of age.

  5. When Do Babies Start Sitting Up? A Pediatric Expert Answers - AOL

    www.aol.com/babies-start-sitting-pediatric...

    From that point forward, you can expect to see fairly rapid motor skill development. ... with a goal of getting in 15 to 30 minutes total for the day when the baby’s about 2 months old.) If you ...

  6. Babbling - Wikipedia

    en.wikipedia.org/wiki/Babbling

    Around 4 months, babies may vary their pitch, and imitate tones in adult speech. [14] Around 5 months, babies continue to experiment with sound, imitating some sounds made by adults. [14] Around 6 months, babies vary volume, pitch and rate. When infants are 6 months old they are finally able to control the opening and closing of the vocal tract ...

  7. Infant visual development - Wikipedia

    en.wikipedia.org/wiki/Infant_visual_development

    The vision of infants under one month of age ranges from 6/240 to 6/60 (20/800 to 20/200). [4] By two months, visual acuity improves to 6/45 (20/150). By four months, acuity improves by a factor of 2 – calculated to be 6/18 (20/60) vision. As the infant grows, the acuity reaches the healthy adult standard of 6/6 (20/20) at six months. [5]