The first two photos show the mother Red-winged Blackbird removing waste from the butt of her young (fecal sac). The third photo shows her giving her young some shade with her body and wings.
A fecal sac is a mucous membrane, generally white or clear with a dark end, that surrounds the feces of some species of nestling birds. It allows parent birds to more easily remove fecal material from the nest. The nestling usually produces a fecal sac within seconds of being fed; if not, a waiting adult may prod around the youngster’s cloaca to stimulate excretion. Young birds of some species adopt specific postures or engage in specific behaviors to signal that they are producing fecal sacs.
Not all species generate fecal sacs. They are most prevalent in passerines and their near relatives, which have young that remain in the nest for longer periods. In some species, the fecal sacs of small nestlings are eaten by their parents. In other species, and when nestlings are older, sacs are typically taken some distance from the nest and discarded. Young birds generally stop producing fecal sacs shortly before they fledge. (Wikipedia)