Breastmilk help to keep cold away?

So far I had 2 cold and Stephen had one cold since Annabelle was born, but she never got it from us. Is she strong or the breastmilk help her to keep the virus away?

I was thinking of quiting breastfeeding, but this makes me to think of continuing doing it. Alough it is much easier for me to just give her formula and Stephen could help me to feed her. Not just the mommy's job anymore and I can go out at night. But if breastmilk really help her to get stronger, then I think I will continue doing it.............