New grand-daughter, Molly, aged two hours

I wanted to try to add a photo, but didn't have anything to add, until the day before yesterday, when my new grand-daughter arrived in the world.  Here is a photograph of her aged just two hours.  However, I see what people mean about the size - any tips on making the photos as big as they used to be?  I notice when you click on the photo it becomes so big that it has to be scrolled to see the whole thing - why is that?