Having Diana of Themyscira suddenly looking like she was carrying life within her would have made for poor continuity, so to navigate around this, the Wonder Woman crew used visual effects to mask her pregnancy, specifically with a green cloth that the actress wore around her belly.
In Gal Gadot’s case, when Wonder Woman conducted its reshoots last November, six months after the main production had ended, she was five months pregnant with her daughter.
Reshoots have become increasingly common for major blockbusters, but certain things aren’t always the same for these later shoots as they were during principal photography.