The<unk>  <unk>  is a primitive<unk>  that normally emerges during the first year of an infant's life and is diminished by the age of 9–10 months. It is a bridging or transitional brainstem<unk>  that is an important developmental stage and is necessary for a baby to transition from lying on the floor to quadruped crawling or walking. In order to progress beyond this development stage, the baby needs to have been successful in unlinking the automatic movement of the head from the automatic movement of the arms and legs. The<unk>  is normally fully developed by 6–8 months and significantly diminished by 2–3 years. If this<unk>  is retained beyond 2–3 years to such a degree that it "modifies voluntary movement", the child is considered to have "immature and abnormal<unk>  development", and this can have broad effects on the child's later development.
Symmetrical tonic neck reflex
Asymmetrical tonic neck reflex
Palmomental reflex
Chaddock reflex
Abnormal posturing
Palmar grasp reflex
Tonic vibration reflex
Dazzle reflex