Exhibit 12

Wyeth

Computation of Ratio of Earnings to Fixed Charges

(In thousands except ratio amounts)



|                                                             |  |                                 |           |                         |      |           |      |   |           |      |   |           |      |  |   |           |   |  |   |          |  
|------------------------------------------------------------ |  | ------------------------------- | --------- | ----------------------- | ---- | --------- | ---- | - | --------- | ---- | - | --------- | ---- |  | - | --------- | - |  | - | -------- | -
|                                                             |  | Three MonthsEnded March 31,2009 |           | Year Ended December 31, |     
|                                                             |  |                                 | 2008      |                         | 2007 |           | 2006 |   |           | 2005 |   |           | 2004 | 
|Earnings (Loss):                                             |  |                                 |           |                         |      |           |      |   |           |      |   |           |      |  |   |           |   |  |   |          |  
|Income (loss) from continuing operations before income taxes |  | $                               | 1,688,452 |                         | $    | 6,338,087 |      | $ | 6,456,682 |      | $ | 5,429,904 |      |  | $ | 4,780,589 |   |  | $ | (129,847 | )
|Add:                                                         |  |                                 |           |                         |      |           |      |   |           |      |   |           |      |  |   |           |   |  |   |          |  
|Fixed charges                                                |  |                                 | 140,200   |                         |      | 621,640   |      |   | 754,290   |      |   | 625,513   |      |  |   | 461,431   |   |  |   | 360,805  |  
|Minority interests                                           |  |                                 | 4,621     |                         |      | 20,481    |      |   | 23,277    |      |   | 29,769    |      |  |   | 26,492    |   |  |   | 27,867   |  
|Amortization of capitalized interest                         |  |                                 | 8,740     |                         |      | 32,485    |      |   | 24,240    |      |   | 22,465    |      |  |   | 21,356    |   |  |   | 9,350    |  
|Less:                                                        |  |                                 |           |                         |      |           |      |   |           |      |   |           |      |  |   |           |   |  |   |          |  
|Equity income (loss)                                         |  |                                 | 152       |                         |      | 649       |      |   | 130       |      |   | (317      | )    |  |   | (104      | ) |  |   | (524     | )
|Capitalized interest                                         |  |                                 | 12,350    |                         |      | 69,500    |      |   | 79,600    |      |   | 71,400    |      |  |   | 46,450    |   |  |   | 86,750   |  
|                                                             |  |                                 |           |                         |      |           |      |   |           |      |   |           |      |  |   |           |   |  |   |          |  
|Total earnings as defined                                    |  | $                               | 1,829,511 |                         | $    | 6,942,544 |      | $ | 7,178,759 |      | $ | 6,036,568 |      |  | $ | 5,243,522 |   |  | $ | 181,949  |  
|                                                             |  |                                 |           |                         |      |           |      |   |           |      |   |           |      |  |   |           |   |  |   |          |  
|Fixed Charges:                                               |  |                                 |           |                         |      |           |      |   |           |      |   |           |      |  |   |           |   |  |   |          |  
|Interest and amortization of debt expense                    |  | $                               | 112,887   |                         | $    | 492,290   |      | $ | 616,983   |      | $ | 498,847   |      |  | $ | 356,834   |   |  | $ | 221,598  |  
|Capitalized interest                                         |  |                                 | 12,350    |                         |      | 69,500    |      |   | 79,600    |      |   | 71,400    |      |  |   | 46,450    |   |  |   | 86,750   |  
|Interest factor of rental expense(1)                         |  |                                 | 14,963    |                         |      | 59,850    |      |   | 57,707    |      |   | 55,266    |      |  |   | 58,147    |   |  |   | 52,457   |  
|                                                             |  |                                 |           |                         |      |           |      |   |           |      |   |           |      |  |   |           |   |  |   |          |  
|Total fixed charges as defined                               |  | $                               | 140,200   |                         | $    | 621,640   |      | $ | 754,290   |      | $ | 625,513   |      |  | $ | 461,431   |   |  | $ | 360,805  |  
|                                                             |  |                                 |           |                         |      |           |      |   |           |      |   |           |      |  |   |           |   |  |   |          |  
|Ratio of earnings to fixed charges                           |  |                                 | 13.0      |                         |      | 11.2      |      |   | 9.5       |      |   | 9.7       |      |  |   | 11.4      |   |  |   | 0.5      |  



|(1) | A 1/3 factor was used to compute the portion of rental expenses deemed representative of the interest factor.
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