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  0 to 1 month  
  -   Eyes can feel the light within 1 feet approximately.  
  -   Sleeping time is quite long, only can use cry to express its emotion.  
  -   Response to the sound, easily get awakened by sudden sound.  
  2 to 3 months  
  -   Able to start to play and smile, the expression is more enrich.  
Can distinguish the color and the shape gradually, whereby the sense of hearing also gradually keen.  
  -   Time of sleep and milk feeding is more orderly.  
  4 to 6 months  
  -   Able to distinguish the sound origin and the eyesight is getting better.  
  -   Starts to recognize people, will be shy while seeing the strangers.  
  -   Starts to laugh and mutter.