Yahoo CEO Marissa Mayer had a baby sometime Sunday night, according to a tweet by her husband Zach Bogue. The child is the couple’s first and it is not clear from the tweet whether he was delivered on September 30 or October 1. No matter — congrats to the new parents! Mayer announced her pregnancy at the same time it was unveiled that she would be taking over Yahoo in July. The former Google exec attracted some measure of discussion over her taking such a big job at the large and troubled company at such a delicate time. Read the full story at All Things D.