Wendy, some of the suggestions are true. You can find a babysitter and another one for the kitchen. Guard is also important. No intention to scare you but there are 'break-ins' in Addis.
I am not in Addis at the moment, but born and grew up there.
I just love assisting people, I have asked a friend back home to get together few list of daycare centers (kindergartens) and curtain manufactures with contact numbers. I will get back to you if he send me the list.
Strollers..not common in Addis. But if you rent/buy a house close to Bole, very limited areas though, you might be able to use it. But doing shopping etc...will be difficult with your kids on a stroller.
There are many children shops in Ethiopia, Bole and Piazza area. Don't just expect superior quality stuff but I am pretty much sure you will find lots of things.
All the best
Yohannes