Unless you've been living in quarrantine since you were exposed, she's already been exposed to whatever you have and will get it or not based on her immune system. There are no illnesses that you get and suffer from with no period between exposure and symptoms... you were exposed probably late last week, and you've been with her since, which means she's exposed already.
Your breasts (supposing she's breastfeeding, not being fed expressed breastmilk, which interferes with this bond) make antibodies to what she's been exposed to on her behalf, because her immune system is not mature enough to thrive without your body's support. They also make antibodies to whatever you've been exposed to, just for her.
The worst thing you could do at this point is tax her system additionally (to what she's already been exposed to) by feeding her another mammal's modified milk AND remove her complementary immune system from her use.
at 3:32 PM on Jul. 7, 2009