Baby barn swallows.

These are 3 baby barn swallows right above our front door. We moved in here in November so of course no birds. We were told we could knock the nest down if we wanted. But I though they will just come back and rebuild, so we left it alone. In the spring here came mom and dad barn swallow. They have been hanging out a lot in the nest. About 2 weeks ago these little babies popped out. Now those babies aren't so little anymore. They look like one or all may fall out soon. They are getting big.