Thanks to the nature of storytelling in the various visual mediums, one day of in story can take weeks or months to portray). As a consequence, pregnancies that are of the standard 8-9 months look like the characters have been pregnant forever.
Then there's times where the decompressed nature of such stories gets leaned on and outright abused.
Things like Comic Book Time and Webcomic Time can [...] [tvtropes.org]