Very New Blackbirds

There was definitely 3 eggs in the nest but I can only see two chicks. Maybe there's still an egg, or another chick, underneath these two. It would be too feeble to have crawled out of the nest.
Despite their small size, and obvious newness, they are very noisy when their parents aren't there. Reminds me of some human children!
Let us hope the third one is there, I'll keep an eye on them but from a distance. I've only been this close twice, hence the previous egg blip and now this one.