The story is good and the graphics show massive effort on the backgrounds and the people.
With objects like the baby seat, it's good to look at the parts of the object and figure out it's function. Like the straps that held the baby to the seat disappeared off into the plastic of the seat. They usually go through a hole or something. Just small details in objects (especially since the carseat was the focus of that scene) would help.
Other than that your movie's pretty decent. The introductory was a bit short, but as the viewer, I got the gist of what was going on.
Good luck with your next chapter~