The<unk>  may be observed in incomplete form in premature birth after the 25th week of gestation, and is usually present in complete form by week 30 (third trimester). Absence or asymmetry of either abduction or adduction by 2 to 3 months age can be regarded as abnormal, as can persistence of the reflex in infants older than 6 months. Furthermore, absence during the neonatal period may warrant assessment for the possibility of developmental complications such as birth injury or interference with brain formation. Asymmetry of the<unk>  is especially useful to note, as it is almost always a feature of root, plexus, or nerve disease. The<unk>  is impaired or absent in infants with kernicterus. An exaggerated<unk>  can be seen in infants with severe brain damage that occurred in-utero, including microcephaly and hydrancephaly. Exaggeration of the<unk> , either due to low threshold or excessive clutching, often occurs in newborns with moderate hypoxic-ischemic encephalopathy. The<unk>  is also exaggerated in infants withdrawing from narcotics. Persistence of the<unk>  beyond 6 months of age is noted only in infants with severe neurological defects, including cerebral palsy.
Moro reflex
Axon reflex
Galant reflex
Landau reflex
Jaw jerk reflex
Red reflex
Tonic vibration reflex
Vestibulo–ocular reflex