A few wonderful choices for first foods for babies, as many pediatric resources are now acknowledging, are tasty and creamy avocados, bananas and sweet potatoes. (wholesomebabyfood.momtastic.com)
In addition, many of the cereals used as first foods for babies starting around six months of age are fortified as well. (thehealthyhomeeconomist.com)
To get to the bottom of your question it might be helpful if we take a glimpse of first foods throughout history. (verywellfamily.com)