Face it, there are plenty of things in the Star Wars prequels that make no sense at all. Some can be attributed to the temptations of modern CGI, while others are clearly due to the difficulty of retrofitting a plot to link to the story in the original trilogy. The prequels were there to set up the character of Darth Vader, his motivations, and the characters that surround him. It all leads to Anakin Skywalker turning to the dark side in Revenge of the Sith because he was afraid his pregnant wife would die. It should not have been so.
Prenatal visits never happen in Episode III, not even offscreen. Despite Anakin’s spiraling paranoia about Padme’s health, doctors or hospitals are bizarrely never mentioned. And the evidence says that Padme never got an ultrasound.
When she confronts Anakin towards the end of the movie—shortly before giving birth—she refers to “our child,” rather than “our children.” It doesn’t make sense for her to be hiding the ball here, she’s making one last emotional appeal to the father of her children, to try to bring him back to the light side. Rather, Padme simply doesn’t know that she’s about to give birth to twins.
Later, when she actually gives birth, everyone is taken aback by the revelation that she’s having babies in the plural.
All of this points to one thing: Padme’s never had an ultrasound. In fact, Padme’s never had a prenatal check-up.
Padme is a privileged character who should have had access to the best medical care in the galaxy, but medical technology in Star Wars leans more toward bionic body parts to replace those sheared off by a light saber. Yeah, it's a feminist issue, one that the entire plot of the Star Wars saga pivots on. Read more about the nonsensical twists that led to Darth Vader at Motherboard.