A Prospective Study of Three Postural Reactions

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Abstract
To assess the development of postural reactions in the prone position, a group of 149 normal infants were followed from birth to 2 yr of age. The Landau reflex was present in 44% of 2 mo. old infants and in 95% at 4 mo. The tonic labyrinthine response (grades 2-4) was seen in 80% of infants at 2 wk, with a marked diminution by the age of 24 mo. The symmetrical tonic neck reflex was detected in < 30% of the infants: the maximum prevalence was at 4-6 mo. of age. The Landau is an early righting reflex which emerges after, and is independent of, the tonic labyrinthine response in the prone position and the symmetrical tonic neck reflex.

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