The Landau reflex falls into a special category. Because it is not present at birth, it really can’t be called a “primitive reflex.” As it does not remain with us for life, it isn’t a postural reflex either. It acts as a “between” reflex or a bridge, helping a baby pass from one stage to another. The Landau reflex appears at about four weeks after birth and then is slowly integrated until it is fully integrated by three and a half years. When the baby lifts its head up, the entire trunk flexes. If the Landau remain present, there may be difficulty with short-term memory, back pain, awkward movements, low tone (hypotonia) and more.