The nudity is strong for a PG-13. Should be R
Nell is shown nude in three scenes in which she goes swimming. She is seen fully nude in silhouette, but her breasts and pubic region can be seen faintly. In another scene, her pubic hair can be clearly seen for a few moments. Her breasts and buttocks are clearly shown in all three scenes for extended periods of time. Not sexual. In one scene, Dr. Jerry is shown sitting nude from the side, his buttocks visible.
Nell is tricked by a group of teenagers into showing them her breasts. She lifts her shirt and dances in a circle and her breasts can be seen for a few seconds.