Slender Marissa Mayer is pictured for the first time since giving birth – so has she lost her baby weight already?

Slender Yahoo boss Marissa Mayer is pictured for the first time since giving birth – and has she lost her baby weight already

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UPDATED:

07:28 GMT, 26 October 2012

A slimline Marissa Mayer has been pictured for the first time since giving birth to her first baby just four weeks ago.

The Yahoo! CEO, 37, who is believed to have named her son Macallister Bogue, posted a photograph of herself on Instagram at the office of Stamped, which her company recently acquired.

Wearing a blue striped dress, she showed off an impressively slender waist that other new mothers are sure to envy.

Slender: Yahoo! CEO Marissa Mayer has been pictured for the first time since giving birth just four weeks ago. She posted a photo of herself on Instagram at the office of Stamped, which her company has acquired

Slender: Yahoo! CEO Marissa Mayer has been pictured for the first time since giving birth just four weeks ago. She posted a photo of herself on Instagram at the office of Stamped, which her company has acquired

She accompanied the photo with the caption: 'Got to visit our new acquisition, Stamped, this morning – happy to be reunited with Robby (@rmstein) and his team!'

The last time Ms Mayer was pictured was
shortly before the birth at the opening of the San Francisco Symphony in
a custom-made Erdem maternity gown. Of course, even then she looked slim, indicating that she didn't really gain much baby weight in the first place.

Just ten days later on September 30, she and her investor husband Zachary Bogue welcomed a son.

A Yahoo! spokesman revealed that she was working again from home within hours, and two weeks later she tweeted that she was putting in full days at the office.

Ms Mayer's decision to take such a brief maternity leave has divided opinion among feminists, mothers and working women.

In bloom: Ms Mayer was previously pictured on September 20 at the opening of the San Francisco Symphony in a custom-made Erdem maternity gown, just ten days before she gave birth

In bloom: Ms Mayer was previously pictured on September 20 at the opening of the San Francisco Symphony in a custom-made Erdem maternity gown, just ten days before she gave birth

However, the new mother has remained
silent on the subject, an action that many believe is disproving the
commonly-held belief that women cannot have it all.

'So far, she's not showing any interest in the conversation,' wrote Lisa Miller in New York Magazine.

Brian Singerman, a former Google
employee who is now a partner at Founders Fund, a venture-capital firm,
said: 'Marissa is very, very, very driven.'

Her friend Dylan Casey, who left Google last year, added: 'She will outwork you; she will outwork anybody.'

Instead of pandering to society's belief that her new-found working
motherhood is setting unrealistic standards for women, she told Fortune
magazine she is simply 'staying in the rhythm of things.'

Back in the office: Ms Mayer was working full days again at Yahoo! just two weeks after giving birth

Back in the office: Ms Mayer was working full days again at Yahoo! just two weeks after giving birth

A Yahoo! spokesman added to New York magazine that 'Marissa is focusing her energy internally'.

Fortune reports that the couple named their son Macallister, following a call for help from family and friends.

Three days after the baby was born,
journalist Jeff Jarvis tweeted: 'Just got a large group email from
@marissamayer. She’s crowdsourcing suggestions for Baby Boy Bogue’s
name! How digital can you get

'Just to be clear, @marissamayer says she'll take suggestions for a name. Nobody suggest Yahoo, now!'

Ms Mayer, who made her name as the 20th
employee at Google, is already worth a rumored $300million.

Her new
salary at Yahoo! is said to be $1million a year and is expected to make
more than $71million over the next five years due to stock options and
bonuses.