The difference between behavior theory from other psychological theories is that a behavior theory is considered to be as a major determinant in regards with the behavior of an individual in which they are affected because of the external stimulus or factors that may affect them or the environment surrounding them rather than their own.
The baby is displaying a behavior of habituation in which a person who shows habituation likely shows disinterest to a certain condition or he or she likely no longer responds or has stopped responding to a certain condition or stimulus in which the baby displays.
It is an example of non-gender free. It is because in order for it to be classified as a gender free word, or for it to be considered to be one, it has to have no connection in regards to a specific gender.