ASHBURN, Va. — Silent protesters. A group in AARP shirts. A crying baby. They all ended up having to leave Donald J. Trump’s rally in Virginia on Tuesday, for various reasons.

The silent protesters were escorted out by staff members midway through his speech, and they went silently, with peace signs over their heads. The AARP-clad group left in a similar fashion.

But the crying baby was initially welcome in the event, or so the crowd was led to believe.

“Don’t worry about that baby. I love babies,” Mr. Trump said. “I hear that baby crying, I like it. What a baby, what a beautiful baby. Don’t worry, don’t worry.”

But the platitudes did nothing to comfort the infant, whose persistent wails seemed to be getting on the candidate’s nerves.