ABSTRACT
We found nursing to be an original mode of behavior which, in the normal infant, achieves a high degree of perfection within a very short time after birth. Behavior of this type is commonly described as instinctive. Broadly speaking, an instinct is any complex adjustive behavior that does not require to be first learned before it can be employed. In other words, an instinct is a dynamic pattern which is more or less perfect the first time it is tried.
