Is Borax toxic to children?

Our dogs brought fleas into our house and I bought borax to put down on the carpet but before I put it down I need to know if it is corrosive or toxic to my daughter. She is only 2. I will have to figure out some to get her out of the house while I put it down and let it work if so. Does anyone know?
Update: I know that it is used as a laundry booster and you can wash kids clothing with it, but it would be diluted and rinsed out if you washed clothes with it. I have sprinkle the actual powder on the floor to kill the fleas and my daughter will be walking on it and around it, undiluted.
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