4 months baby intellectual development standards, can be from the following five aspects as a reference standard: 1, large motor: prone position elbow support head up 90 degrees, holding armpits can stand for a moment, can appear pointed feet. 2, fine motor: passive handheld rattle can shake and watch the rattle. 3, adaptive ability: in front of the eyes to put the small pills can be occasional attention to the small pills, behind the back or near the ear call can find the source of the sound. 4, language skills : can shout and babble. 5, social behavior: can recognize relatives, such as seeing the mother when there is excitement.