Figure 3.

Feeding group–specific fitted stretched penile length trajectories across infant age adjusted for weight for length z-score. Trajectories for soy formula–fed infants are represented by the red solid line, cow milk formula–fed infants are represented by the blue long-dashed line, and breastfed infants are represented by the green dot-dashed line. Shaded bands represent 95% CI for each feeding group–specific trajectory: soy formula fed, diagonal upward to the right; cow milk formula fed, solid gray; breastfed, diagonal downward to the right. (A) Open symbols represent individual penile lengths for infants in the study; red circles for soy formula fed infants, blue squares for cow milk formula–fed infants, and green triangles for breastfed infants. (B) Feeding group–specific trajectories fitted to the data were shifted vertically to a common intercept at 0 to better display postnatal changes (ie, fitted penile length at a given age minus fitted penile length at birth). Thus, the vertical axis represents change in stretched penile length since birth.