Delays vs. motor - valentine - Recognizing Developmental Delays in Children - WebMD

Gross motor skills, as well as many other activities, require postural control. Infants need to control the heads to stabilize their gaze and to track moving objects. They also must have strength and balance in their legs to walk. [1] Newborn infants cannot voluntarily control their posture . Within a few weeks, though, they can hold their heads erect, and soon they can lift their heads while prone. By 2 months of age, babies can sit while supported on a lap or an infant seat, but sitting independently is not accomplished until 6 or 7 months of age. Standing also develops gradually across the first year of life. By about 8 months of age, infants usually learn to pull themselves up and hold on to a chair , and they often can stand alone by about 10 to 12 months of age. [1] There is a new device called a “Standing Dani” developed to help special needs children with their posture. [2]

It's very true that an electric motor can rev higher than a gas one, but its efficiency changes at every speed. An electric motor has a torque curve, a power curve, and an efficiency curve. A gearbox will help keep it at maximum efficiency at all times.

Primarily through retrospective video analysis, researchers have identified early motor differences in children with ASD. Kanner (1943), who first identified ASD, noted that the infants exhibited hypotonia, or low muscle tone (similar to infants with DS). Other researchers have also observed hypotonia (Adrien et al., 1993; Ming, Brimacombe, & Wagner, 2007). For example, Ming et al. (2007) reviewed the clinical records of 154 children diagnosed with ASD in an attempt to determine the types and prevalence of motor impairments in this population, particularly hypotonia, delayed motor milestones, coordination issues, and toe walking. Children ranged in age from 2 to 18 years, with a mean age of 6 years. Reflecting the gender differences within the ASD population, there were 126 males and 28 females within the study. All of the children were on the autism spectrum: 74 were diagnosed with autism, 70 with PDD-NOS, and 10 with AS. The researchers determined that 51% of the group demonstrated hypotonia as infants; the prevalence of hypotonia decreased over time to 38% in the age range of 7 to 18 years. Not all retrospective studies have indicated that infants with autism have hypotonia. Saint-Georges et al. (2010) performed an exhaustive research review using retrospective video analysis and determined that across the 41 studies reviewed, hypotonia was not a consistent finding.

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