Parents.com has an article that provide a Month-by-Month Guide to Baby's Emotional Development. (There is also a guide to developmental milestones, if you are interested) Of course these things are only guidelines, but I thought I was pretty interesting. Here is there month-by-month breakdown:Month 1
Makes eye contact
Cries for help
Responds to parents' smiles and voices
Month 2
Begins to develop a social smile
Enjoys playing with other people and may cry when play stops
Prefers looking at people rather than objects
Studies faces
Gurgles and coos in response to sounds around her
First begins to express anger
Month 3
Starts a "conversation" by smiling at you and gurgling to get your attention
Smiles back when you smile at him. The big smile involves his whole body -- hands open wide, arms lift up, legs move
Can imitate some movements and facial expressions
Month 4
Is intrigued by children. Will turn toward children's voices in person or on TV
Laughs when tickled and when interacting with others
Cries if play is disrupted
Month 5
Becomes increasingly assertive
Can differentiate between family members (parents and siblings) and strangers
Likes to play during meals
Month 6
May quickly tire of a toy but will never tire of your attention
Temperament becomes increasingly apparent. You'll see whether she tends to be easygoing or easily upset; gentle or active
Recognizes his own name
Coos for pleasure and cries with displeasure
Can make noises like grunts and squeals; clicks his tongue
Month 7
Starts to understand the meaning of "no"
Enjoys social interaction
Expresses anger more strongly
Tries to mimic adult sounds
Month 8
Can differentiate between familiar and unfamiliar
May become shy or anxious with strangers
Cries in frustration when he can't reach a toy or do something he wants to do
Month 9
Imitates gestures that other people make
Looks at correct picture when an image is named
Smiles and kisses own image in the mirror
Likes to play near parent (i.e., in kitchen while Mom is cooking)
May be more sensitive to the presence of other children
Month 10
Separation anxiety may begin
Self-esteem begins to develop
Responds to positive recognition such as clapping
Becomes cautious of heights
Shows moods such as sad, happy, and angry
Month 11
Tries to gain approval and avoid disapproval
Can be uncooperative
Month 12
May have temper tantrums
Can fluctuate between being cooperative and uncooperative
Shows a developing sense of humor
May cling to parents or one parent in particular
