Landau reflex / reaction

With the examiner’s hand supporting the trunk - face down - this boy (8-months-old) raises his head, arch his back and extends his arms and legs and thus showing muscle tone. When the head is gently pushed into flexion, the legs drop into flexion like a clasp-knife. The reaction is elicitable from the 3rd to 9th month. Eber Landau (1878 - 1959) was a Latvian embryologist. For more baby reflexes check my playlist: