Bry, but then is there a spacesuit for the blue Lilo 'n' Stitch guy (I forget if he is Lilo or Stitch). I remember my son was only a few months old and thought, "there'd be no way for him to mobile on a starship since he's too small for all the chairs.
I've seen a lot of people make this odd assumption about Titan, that nonhumanoid crew wouldn't be able to function on it because it's only designed for humanoids. But that's forgetting what the first book clearly established -- that it's not the typical Starfleet vessel we saw onscreen, because it was specifically designed to accommodate a diverse, nonhumanoid crew before it was launched. Any necessary accommodations were built in from the start.
Really, it's not that hard to design an environment to be accessible to individuals with different physical abilities. In fact, it's mandatory to do so under the Americans with Disabilities Act. It's doable in the here and now, so it shouldn't be any major obstacle for a technology centuries ahead of ours. Realistically, all starships should be designed with universal accessibility in mind. After all, even if your crew is humanoid, you never know when you might need to accommodate diplomats or refugees or other guests from a nonhumanoid species. The only reason we don't see them designed that way onscreen is because Star Trek is a make-believe TV show in which all the participants are human beings, and because the concern is about what looks good onscreen rather than what would really be functional (which is why shuttlecraft don't have airlocks or bathrooms).