It's a boy! Now Yahoo's Marissa plans a return to work in two weeks

Yahoo! CEO Marissa Mayer gave birth to a boy yesterday, and is still intent on getting back to work as soon as possible.

“Mom and baby are doing great -- we couldn’t be more excited,” Mayer’s husband, Zachary Bogue, said on Twitter . The family haven't chosen a name yet.

Mayer and the baby are healthy, a Yahoo spokeswoman said. Mayer, 37, is working remotely, and plans to return to the office in about one to two weeks, she said.

The CEO “is involved in all critical decision making,” the spokeswoman added. “She also has an incredibly strong executive leadership team in place.”

The number of women serving as CEOs of Fortune 500 companies is around 20. Some - including PepsiCo ’s Indra Nooyi and Xerox’s Ursula Burns -- had children before becoming CEOs - but few have shared Marissa's experience!

One who did was Drum blogger Susan Cantor. She was pregnant with her third child when she was named CEO of Lowe New York, a division of Lowe Worldwide.

"I committed, at the time of my appointment, to return to work in a month's time," she wrote. " . I kept my promise to return to the office just four weeks after giving birth.

"I remember at the time having a sea of conflicting feelings. I was entirely dedicated to my job and equally dedicated to my children and I always thought I did a rather good job at both. But after only four weeks, and for the first time in my career, I felt stress about leaving my baby and resentment that my place of employ was forcing me to leave her.

"My subsequent advice to women who ask me what to do about maternity leave is, "Take 12 weeks!" In my heart, I think this is the right amount of time to bond with your child, get your business head back and re-enter the fray."

Susan's comments, first published in AdAge, ricocheted across the country. Many women agreed with her.

Marissa takes a different view: “I like to stay in the rhythm of things,” she said in an interview with Fortune. “My maternity leave will be a few weeks long and I’ll work throughout it.”

CEO since July, Mayer is "realigning the company's leadership" in her drive to reverse three years of declining revenue and market share losses to Facebook and her former employer,Google .

Yahoo shares fell 1.1 percent to $15.80 at 3:25 p.m. in New York. The stock has gained more than 20 percent in the past year.