I met my DH, married and had my 1st child while I was a nanny for the same family. I brought him to work with me for almost 2 years. It was wonderful. In my case my charges were older, 5 and 8. The 3 kids loved eachother. My big kids came 1st when I was on duty. My son slept on the floor, in a portacrib, in a car - whenever and where ever. The Bigs dedicated his schedule. The only thing we slowed down for was nursing and poops.

I think this is the only fair way to bring your own kid to work. You're going to have to be okay with your kid playing 2nd fiddle sometimes. I do think it was worth the trade off. Everyone got my loving care.
I know my NF loved the arrangement as well. It only ended because their mom decided to stay home for a year.