When a baby is born, she tends to sleep a lot. This sometimes worries new parents who aren't quite sure how much sleep is too much. The following chart lists the typical amount of time a baby will sleep in a day:

      
           Typical Number of 
        Hours a Baby Will Sleep

Age         Nighttime  Daytime    Total
------------------------------------------   
1 week        8.5         8        16.5
1 month       8.5         7        15.5
3 months     10           5        15
6 months     12           4.25     16.25
9 months     11           3        14
1 year       11.25        2.5      13.75
18 months    11.5         2        13.5
2 years      11.5         1.5      13
3 years      11           1        12

Source:

Ferber, Richard: Solve Your Child's Sleep Problems. New York: Simon & Schuster, 1985.