Exhibit 12

Wyeth

Computation of Ratio of Earnings to Fixed Charges

(in thousands except ratio amounts)



|                                                             |  |                               |           |   |                         |   |           |      |  |   |           |   |  |      |          |   |  |   |           |   |  |   |          
|------------------------------------------------------------ |  | ----------------------------- | --------- | - | ----------------------- | - | --------- | ---- |  | - | --------- | - |  | ---- | -------- | - |  | - | --------- | - |  | - | ---------
|                                                             |  | Six Months EndedJune 30, 2007 |           |   | Year Ended December 31,
|                                                             |  | 2006                          |           |   | 2005                    |   |           | 2004 |  |   | 2003      |   |  | 2002
|Earnings (Loss):                                             |  |                               |           |   |                         |   |           |      |  |   |           |   |  |      |          |   |  |   |           |   |  |   |          
|Income (loss) from continuing operations before income taxes |  | $                             | 3,459,792 |   |                         | $ | 5,429,904 |      |  | $ | 4,780,589 |   |  | $    | (129,847 | ) |  | $ | 2,361,612 |   |  | $ | 6,097,245
|                                                             |  |                               |           |   |                         |  
|Add:                                                         |  |                               |           |   |                         |   |           |      |  |   |           |   |  |      |          |   |  |   |           |   |  |   |          
|Fixed charges                                                |  |                               | 353,932   |   |                         |   | 625,513   |      |  |   | 461,431   |   |  |      | 360,805  |   |  |   | 346,564   |   |  |   | 430,449  
|Minority interests                                           |  |                               | 14,712    |   |                         |   | 29,769    |      |  |   | 26,492    |   |  |      | 27,867   |   |  |   | 32,352    |   |  |   | 27,993   
|Amortization of capitalized interest                         |  |                               | 11,987    |   |                         |   | 22,465    |      |  |   | 21,356    |   |  |      | 9,350    |   |  |   | 8,772     |   |  |   | 8,866    
|                                                             |  |                               |           |   |                         |  
|Less:                                                        |  |                               |           |   |                         |   |           |      |  |   |           |   |  |      |          |   |  |   |           |   |  |   |          
|Equity income (loss)                                         |  |                               | (40       | ) |                         |   | (317      | )    |  |   | (104      | ) |  |      | (524     | ) |  |   | (468      | ) |  |   | 20,766   
|Capitalized interest                                         |  |                               | 38,500    |   |                         |   | 71,400    |      |  |   | 46,450    |   |  |      | 86,750   |   |  |   | 115,800   |   |  |   | 88,008   
|                                                             |  |                               |           |   |                         |   |           |      |  |   |           |   |  |      |          |   |  |   |           |   |  |   |          
|Total earnings as defined                                    |  | $                             | 3,801,963 |   |                         | $ | 6,036,568 |      |  | $ | 5,243,522 |   |  | $    | 181,949  |   |  | $ | 2,633,968 |   |  | $ | 6,455,779
|                                                             |  |                               |           |   |                         |   |           |      |  |   |           |   |  |      |          |   |  |   |           |   |  |   |          
|Fixed Charges:                                               |  |                               |           |   |                         |   |           |      |  |   |           |   |  |      |          |   |  |   |           |   |  |   |          
|Interest and amortization of debt expense                    |  | $                             | 287,798   |   |                         | $ | 498,847   |      |  | $ | 356,834   |   |  | $    | 221,598  |   |  | $ | 182,503   |   |  | $ | 294,160  
|Capitalized interest                                         |  |                               | 38,500    |   |                         |   | 71,400    |      |  |   | 46,450    |   |  |      | 86,750   |   |  |   | 115,800   |   |  |   | 88,008   
|Interest factor of rental expense (1)                        |  |                               | 27,634    |   |                         |   | 55,266    |      |  |   | 58,147    |   |  |      | 52,457   |   |  |   | 48,261    |   |  |   | 48,281   
|                                                             |  |                               |           |   |                         |   |           |      |  |   |           |   |  |      |          |   |  |   |           |   |  |   |          
|Total fixed charges as defined                               |  | $                             | 353,932   |   |                         | $ | 625,513   |      |  | $ | 461,431   |   |  | $    | 360,805  |   |  | $ | 346,564   |   |  | $ | 430,449  
|                                                             |  |                               |           |   |                         |   |           |      |  |   |           |   |  |      |          |   |  |   |           |   |  |   |          
|Ratio of earnings to fixed charges                           |  |                               | 10.7      |   |                         |   | 9.7       |      |  |   | 11.4      |   |  |      | 0.5      |   |  |   | 7.6       |   |  |   | 15.0     



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