My colleague with the office next to mine is on parental leave but brings her baby to the office most days to work. She says it's a way for her to escape her 3 year old, who really makes work impossible!
A former student of mine (from Hungary) wrote an article about attending conferences with her baby, giving 22 talks in the first two years! Here's the
link.. It sounds pretty crazy to me, so I'm not exactly recommending it.