Since I have only been BFing for a little over two months, I don't profess to know a lot....but I do know that 3 weeks ago I had the worst flu/cold/sore throat/ cough that I've ever had (and it lasted for 2 wks), and DD got nothing! However, my mother has always told me that for the first three months the LO won't get sick as a result of all the antibodies from you, but after that, she will get a few colds as she starts to develop her own immune system and antibodies (in fact, she is supposed to get those colds in order for her to fight off anything else that may come!). So I guess one can deduce that your LO has already, just as a result of your BF for the time that you have, has begun to develop her own immune stystem which will help her fight off anything that will come her way now. I would think that it has been "jump started" it so that even when you ween her a bit when she starts daycare, she should have built up a better deffense than if not BF at all. I would also think that as you continue to BF, it will give her all the more deffense that she has against those nasty germs.