Exhibit 12

Wyeth

Computation of Ratio of Earnings to Fixed Charges

(In thousands except ratio amounts)



|                                                             |  |                                    |   |  |                         |   |  |            |   |  |           |   |  |            |   |  |           
|------------------------------------------------------------ |  | ---------------------------------- | - |  | ----------------------- | - |  | ---------- | - |  | --------- | - |  | ---------- | - |  | ----------
|                                                             |  | Nine MonthsEnded September 30,2007 |   |  | Year Ended December 31,
|                                                             |  | 2006                               |   |  | 2005                    |   |  | 2004       |   |  | 2003      |   |  | 2002      
|Earnings (Loss):                                             |  |                                    |   |  |                         |   |  |            |   |  |           |   |  |            |   |  |           
|Income (loss) from continuing operations before income taxes |  | $5,093,650                         |   |  | $5,429,904              |   |  | $4,780,589 |   |  | $(129,847 | ) |  | $2,361,612 |   |  | $6,097,245
|                                                             |  |                                    |   |  |                         |  
|Add:                                                         |  |                                    |   |  |                         |   |  |            |   |  |           |   |  |            |   |  |           
|Fixed charges                                                |  | 546,771                            |   |  | 625,513                 |   |  | 461,431    |   |  | 360,805   |   |  | 346,564    |   |  | 430,449   
|Minority interests                                           |  | 18,755                             |   |  | 29,769                  |   |  | 26,492     |   |  | 27,867    |   |  | 32,352     |   |  | 27,993    
|Amortization of capitalized interest                         |  | 17,527                             |   |  | 22,465                  |   |  | 21,356     |   |  | 9,350     |   |  | 8,772      |   |  | 8,866     
|                                                             |  |                                    |   |  |                         |  
|Less:                                                        |  |                                    |   |  |                         |   |  |            |   |  |           |   |  |            |   |  |           
|Equity income (loss)                                         |  | (561                               | ) |  | (317                    | ) |  | (104       | ) |  | (524      | ) |  | (468       | ) |  | 20,766    
|Capitalized interest                                         |  | 61,000                             |   |  | 71,400                  |   |  | 46,450     |   |  | 86,750    |   |  | 115,800    |   |  | 88,008    
|                                                             |  |                                    |   |  |                         |   |  |            |   |  |           |   |  |            |   |  |           
|Total earnings as defined                                    |  | $5,616,264                         |   |  | $6,036,568              |   |  | $5,243,522 |   |  | $181,949  |   |  | $2,633,968 |   |  | $6,455,779
|                                                             |  |                                    |   |  |                         |   |  |            |   |  |           |   |  |            |   |  |           
|                                                             |  |                                    |   |  |                         |  
|Fixed Charges:                                               |  |                                    |   |  |                         |   |  |            |   |  |           |   |  |            |   |  |           
|Interest and amortization of debt expense                    |  | $444,320                           |   |  | $498,847                |   |  | $356,834   |   |  | $221,598  |   |  | $182,503   |   |  | $294,160  
|Capitalized interest                                         |  | 61,000                             |   |  | 71,400                  |   |  | 46,450     |   |  | 86,750    |   |  | 115,800    |   |  | 88,008    
|Interest factor of rental expense (1)                        |  | 41,451                             |   |  | 55,266                  |   |  | 58,147     |   |  | 52,457    |   |  | 48,261     |   |  | 48,281    
|                                                             |  |                                    |   |  |                         |   |  |            |   |  |           |   |  |            |   |  |           
|Total fixed charges as defined                               |  | $546,771                           |   |  | $625,513                |   |  | $461,431   |   |  | $360,805  |   |  | $346,564   |   |  | $430,449  
|                                                             |  |                                    |   |  |                         |   |  |            |   |  |           |   |  |            |   |  |           
|                                                             |  |                                    |   |  |                         |  
|Ratio of earnings to fixed charges                           |  | 10.3                               |   |  | 9.7                     |   |  | 11.4       |   |  | 0.5       |   |  | 7.6        |   |  | 15.0      



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