Yahoo! Inc. Chief Executive Officer Marissa Mayer gave birth to a baby boy Sunday, adding new parenthood to the list of challenges she’s facing as the head of a struggling Web portal.

“Mom and baby are doing great — we couldn’t be more excited,” Mayer’s husband, Zachary Bogue, posted in his Twitter feed today.

The family hasn’t yet chosen a name, Anne Espiritu, a spokeswoman for Yahoo (Nasdaq: YHOO), wrote in an e-mail. Mayer and the baby are healthy, she said.

Mayer continues to lead the company, working remotely, and is planning to return to the office in about one to two weeks, Espiritu said. That’s in keeping with remarks by Mayer, who said in a July interview with Fortune that her maternity leave would be brief.

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

Yahoo said last week that it hired Ken Goldman, a technology-industry veteran with three decades of experience in software and Internet companies, to succeed Tim Morse as chief financial officer. CEO since July, Mayer is realigning leadership in her drive to reverse three years of declining revenue and market share losses to Facebook Inc. and her former employer, Google Inc.

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

Mayer, an engineer and former Google executive who helped develop the company’s home page and maps products, was hired after a nine-week search for a CEO.