Does breastmilk help a sick toddler

As the title says.. my 14 month LO is sick and I was wondering if giving him some of my frozen breastmilk would help him recover faster. He only got breastmilk as a baby, and he was fully transitioned to cow’s milk by the time he was one. I’ve heard different things from different people and was wondering if there are any studies on this. I’m going to give him the breastmilk regardless but wanted to see if there’s any actual scientific evidence.