Exhibit 12

Wyeth

Computation of Ratio of Earnings to Fixed Charges

(In thousands except ratio amounts)



|                                                             |  |                                 |      |  |                         |  |            |      |  |            |      |  |           |      |  |            |  
|------------------------------------------------------------ |  | ------------------------------- | ---- |  | ----------------------- |  | ---------- | ---- |  | ---------- | ---- |  | --------- | ---- |  | ---------- | -
|                                                             |  | Three MonthsEnded March 31,2008 |      |  | Year Ended December 31, | 
|                                                             |  |                                 | 2007 |  | 2006                    |  |            | 2005 |  |            | 2004 |  |           | 2003 | 
|Earnings (Loss):                                             |  |                                 |      |  |                         |  |            |      |  |            |      |  |           |      |  |            |  
|Income (loss) from continuing operations before income taxes |  | $1,757,987                      |      |  | $6,456,682              |  | $5,429,904 |      |  | $4,780,589 |      |  | $(129,847 | )    |  | $2,361,612 |  
|                                                             |  |                                 |      |  |                         | 
|Add:                                                         |  |                                 |      |  |                         |  |            |      |  |            |      |  |           |      |  |            |  
|Fixed charges                                                |  | 153,560                         |      |  | 754,290                 |  | 625,513    |      |  | 461,431    |      |  | 360,805   |      |  | 346,564    |  
|Minority interests                                           |  | 4,566                           |      |  | 23,277                  |  | 29,769     |      |  | 26,492     |      |  | 27,867    |      |  | 32,352     |  
|Amortization of capitalized interest                         |  | 7,700                           |      |  | 24,240                  |  | 22,465     |      |  | 21,356     |      |  | 9,350     |      |  | 8,772      |  
|                                                             |  |                                 |      |  |                         | 
|Less:                                                        |  |                                 |      |  |                         |  |            |      |  |            |      |  |           |      |  |            |  
|Equity income (loss)                                         |  | (37                             | )    |  | 130                     |  | (317       | )    |  | (104       | )    |  | (524      | )    |  | (468       | )
|Capitalized interest                                         |  | 15,500                          |      |  | 79,600                  |  | 71,400     |      |  | 46,450     |      |  | 86,750    |      |  | 115,800    |  
|                                                             |  |                                 |      |  |                         |  |            |      |  |            |      |  |           |      |  |            |  
|Total earnings as defined                                    |  | $1,908,350                      |      |  | $7,178,759              |  | $6,036,568 |      |  | $5,243,522 |      |  | $181,949  |      |  | $2,633,968 |  
|                                                             |  |                                 |      |  |                         |  |            |      |  |            |      |  |           |      |  |            |  
|                                                             |  |                                 |      |  |                         | 
|Fixed Charges:                                               |  |                                 |      |  |                         |  |            |      |  |            |      |  |           |      |  |            |  
|Interest and amortization of debt expense                    |  | $123,633                        |      |  | $616,983                |  | $498,847   |      |  | $356,834   |      |  | $221,598  |      |  | $182,503   |  
|Capitalized interest                                         |  | 15,500                          |      |  | 79,600                  |  | 71,400     |      |  | 46,450     |      |  | 86,750    |      |  | 115,800    |  
|Interest factor of rental expense(1)                         |  | 14,427                          |      |  | 57,707                  |  | 55,266     |      |  | 58,147     |      |  | 52,457    |      |  | 48,261     |  
|                                                             |  |                                 |      |  |                         |  |            |      |  |            |      |  |           |      |  |            |  
|Total fixed charges as defined                               |  | $153,560                        |      |  | $754,290                |  | $625,513   |      |  | $461,431   |      |  | $360,805  |      |  | $346,564   |  
|                                                             |  |                                 |      |  |                         |  |            |      |  |            |      |  |           |      |  |            |  
|                                                             |  |                                 |      |  |                         | 
|Ratio of earnings to fixed charges                           |  | 12.4                            |      |  | 9.5                     |  | 9.7        |      |  | 11.4       |      |  | 0.5       |      |  | 7.6        |  



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