Pregnancy can have a dramatic impact on your figure. For some women, the effect is positive. Mexican actress Salma Hayek famously "filled out" after giving birth to her daughter in 2007, and after their show this year, Victoria's Secret marketing exec Ed Razek singled out mommy models Miranda Kerr, Alessandra Ambrosio, and Doutzen Kroes for being "more beautiful than ever." However, not everyone is as happy as these women with their post-baby bodies. Even if you follow their demanding post-pregnancy routines, you may not achieve the results they did.