达尔文反射（Darwinian reflex），又名抓握反射（grasp reflex）或罗曼尼斯反射，属于新生儿反射的一种。

这是婴儿的一种倾向，对于任何接触其手掌和脚掌的物体，都会立刻引起婴儿反射性的动作，手将会握成拳头，紧紧地抓住放进手中的物体不放；脚也会弯曲。如果试图强行从婴儿的手中取走物体，婴儿将会抓得更紧。这种抓握十分牢固，抓握的力量可以非常之大，甚至足以能够承受婴儿自身的体重。有一部分婴儿甚至能够做到，仅仅通过手和脚的抓握而悬空不掉下来：成人让婴儿的两只小拳头握紧一根棍棒，然后通过拉这根棍棒，就可以使婴儿的整个身体站立起来或悬挂起来。

Palmar grasp reflex (sometimes simply called grasp reflex) is a primitive reflex. It appears as early as 16 weeks in utero and persists until five or six months of age. When an object is placed in the infant's hand and strokes their palm, the fingers will close and they will grasp it with a palmar grasp. The grip is strong but unpredictable; though it may be able to support the child's weight, they may also release their grip suddenly and without warning. The reverse motion can be induced by stroking the back or side of the hand.