I suspect the Girafarig pre-evo (called "Twinz" by the translators) is supposed to represent a yin-yang symbol (like Girafarig) and a conjoined fetus. If I had to tweak the design to make this clearer, I would add a sphere of gelatin like Reuniclus to represent a womb.
As cute as they are, I kinda am glad they didn't go into the final games. That left much more space for other cool Pokémon to go in. That Meowsy has to be the cutest thing ever though. Can't go wrong with a kitten ever.