How many times has your baby been sick so far?

La
I'm curious to know how often late August and September babies have been sick so far? My son is 7.5 months and has had one small cold so far and he was really quite content through it. He didn't seem to notice. He had it at about 4 months. 
I've always heard breastfed babies rarely get sick. My son has been exclusively on formula so I have a theory that it's more so about babies living around germs to build their immunity than breastfeeding. I have 3 dogs so while my house isn't cluttered it isn't a sterile environment that many babies are brought home to. I never sterilized his Bottles, etc. 

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