I'll be honest, I am not good about checking expiration dates on anything I buy besides milk. Last week DH was feeding DS his first store-bought baby food and he noticed that it was past its October expiration date. This means I bought it past date, as well. Yesterday I was buying DS some yogurt, and the first carton I picked up was three days expired. Both of these items were organic baby food items from very reputable stores. It may not have been a big deal for DS to eat foods past their best-by dates, but I didn't want to chance it. Now I am looking at the dates on everything.