So curious about boy vs girl

Michelle • Boston : Mom of 3 expecting #4 💙💗💙💗

Top image is my son at 12.5 weeks. Bottom image is current baby 12.5 weeks. Notice the different skull shape? Bottom babes skull lays slightly flatter. I’m starting to wonder if this means opposite sex because I’ve heard skull shape differs between sexes. Is anyone educated on this topic ? I am surely not 😂