my own first mouth toy

Babies get to know things with their mouths. Inside the womb, the only thing the fetus can put in its mouth are its own fingers ["a child's body is the first toy"]. How early do humans get feeling in their fingers? Through sucking and physical sensation, do they know they are sucking themselves? Through sucking and not feelings, do they know they are sucking something other than themselves?

In Purity and Danger, Mary Douglas remarks Sartre’s essay on stickiness. Honey has the power to show the distinction between “the subjective experiencing self and the experienced world”-how viscous, sticky substances “attack the boundary between myself and it”

"The child eventually moves from its own fingers to nipple, then to spoon or cup...chewing gum, smoking cigarettes, crunching hard candy, chewing the end of pencil/pen".