Single term to include children from multiple births

I’m wondering if there is single term to indicate that a child is a twin, triplet, quadruplet, etc., without specifying the exact number of siblings in the multiple birth. For example, a “multiple-birth child”.

Solution 1:

From various websites like sjmoms.com, it looks like the term multiples is commonly used for twins, triplets, etc. So I assume one of the multiples could simply be called a multiple.

Solution 2:

"Gemel(s)" (late fourteenth century-) might have worked had it not gone extinct. The adjective "geminate" would come in handy. "Geminate brothers" got some hits just now, and "geminate sisters" even more . . .