"Harley wanted a normal family with Joker hence the baby in her vision. I figured she would have endlessly pestered Mr J about having a kid. SO he had Mr. Frost buy some onesies. The circle represents how he sees Harley." David Ayer, Twitter, 28 MAR 2020.
YouTube user Taj Holmes has put together a trailer for 'Suicide Squad' that suggests what it might be like if the Joker had been the main villain of the movie!