My DD1 has had 2 colds in the past few months, and so DD2 has too! It's just the saddest thing when that tiny little nose is all stuffed up

Any tips for how to keep baby from getting sick? My toddler just started preschool so I'm sure she's going to have a ton of colds this fall/winter and I'd really like to do whatever I can to keep baby from sharing every single one of them. I'm trying to be deligent about hand washing and wiping things down around the house, but would love to hear any tips and tricks other mamas use. Thanks!
Re: STM's- How do you keep baby from getting toddler's colds?
Hand washing is most important. No face to face contact. Breastfeeding is helpful. You can also try a tiny TINY bit of bacitracin on the out skirt of little ones nostrils to capture bacteria.