Perfectly apparent now, to the justices sitting on today’s court as well as the public, are the liveliness and humanity of babies at 15 weeks of gestation—the age at which Mississippi proposes to protect them from elective termination.

Nestled within their mothers, these fetuses on average are 6.4 inches long and weigh 4.1 ounces. They have the proportions of a newborn—seemingly all head and rounded belly. The major organs are formed and functioning, and although the child receives nutrients and oxygen through the mother’s umbilical cord, the fetal digestive, urinary and respiratory systems are practicing for life outside the womb. The sex of the child is easy to discern by this point. The baby swallows and even breathes, filling the lungs with amniotic fluid and expelling it. The heart is fully formed, its four chambers working hard, with the delicate valves opening and closing.

A healthy baby at 15 weeks is an active baby. Unless the child is asleep, kicking and arm-waving are commonly seen during ultrasound evaluations. The fetal spine is a marvel of intricacy, and it is most often gently curved as the fetus rests against the mother’s uterine wall. Often, I watch as babies plant their feet against the uterine wall and stretch vigorously. Sometimes a delicate hand—with all five fingers—approaches the face and appears to scratch an itch. Fingernails aren’t visible, but they are present. We can see how the bones of the leg meet the tiny ankles and the many-boned feet.