When Dorie was little and had a little friend, I would put them in the same swing. At parks there is usually only 1 or 2 baby swings and they always have lines. So when I took Elinor and Henri to the park I threw them in together. It helps too because she can't sit up as good as Henri so she can lean on him.
I took videos of each of them the other day. Henri was super smiley and giggly and Elinor was super focused on the kid swinging next to them.
Untitled from caitlin mccormick on Vimeo.