Warning: implied possible character death through miscarriage or childbirth (though it's only one interpretation).
"Loss"
Phil squeezed Bucky's hand once, even though comfort was absolutely pointless, and then walked unsteadily down the hospital corridor.
Bucky bowed his head, and the tears fell freely as he clenched his fist, the metal grating quietly…
And from his other hand fell the woolly, pink baby bonnet which would never be worn.
Three-sentence fic again.
Background open to interpretation; might not be child death, but I needed to warn for that. Might be that Bucky and Phil were supposed to adopt, and they were rejected, or the parents changed their minds, or the child was given to someone else. Might be someone else's child who died. Could be ABO, general mpreg, adoption, surrogacy… Whatever it is, the title stands.