Hummingbird babies (1 Viewer)

We have a nest in the pine tree outside our kitchen window (southern California), probably Costa's or Anna's Hummingbird, we have a lot of both and the females look alike to me. I think the eggs hatched yesterday because Mama is spending way more time now flying around and coming back and sticking her beak down into the nest so I presume she is feeding the babies. I can't see down into the nest so my question is, about how long will it be before the babies will be big enough to be visible sticking their heads out?

You'll probably starting seeing the tips of the bills in 5 or 6 days. The babies typically fledge at about 20 days so more than just the bills should be visible well before then.

Here's a couple of Black-chinned nestlings I photographed a couple of years ago: http://www.flickr.com/photos/fugl/2683008223/in/set-72157602214826948