I See Three Baby Robins

We are having so much fun watching these little guys. About 5 days ago we could see white tufts and tiny beaks when mom was feeding them. Then!!! All of a sudden they are Huge. Do they really get that big that fast? They are dark now and when they open their mouths they are at least a good inch about the edge of the nest, from the angle we have. Mom had a big fight in my tree with some other birds that were aggravating the homestead. So dad came over and mom went in the for the kill. There were tons of leaves all over from the episode but it just goes to show, no one ever messes with a mom and her babies.