London: Actress Jessica Alba who is expecting her second child says she fails to understand how other celebrity mothers lose their baby weight and fears she
will never be able to do it.

The 30-year-old, who also has a three year daughter, Honor, with husband Cash Warren, is amazed by how supermodel Gisele Bundchen dropped the pregnancy pounds and flawlessly flaunted a bikini in a matter of weeks after giving birth, according to reports.

"I can't ever get down to the weight I was before I had Honor... My body's just different. The jeans just sort of zip up differently, and things hang differently. It's a miracle what happens, but you definitely are different afterward. Unless you're Gisele," Alba said.

However, Alba insists pregnancy has had at least one positive effect on her body - she's now more comfortable with her own sexuality.

"It wasn't something I embraced until I had my daughter. I saw how incredible and amazing it is to be a woman and to be able to create a life. There's a reason why certain areas of the body are desirable because it all leads to reproduction," she added.