Oh come on! "Sewage Baby" can't be the worst movie ever made. But surely it's one of the crappiest, unintentionally funny exploitation/slasher flicks from the past 20 years.
The premise can be offensive but after half an hour it gets really cheesy and easy to enjoy. We know that the parents' solution for their "mistake" is solved in a truly horrible place where there are whores and also abortion practices. So our classy couple gets rid of their unborn child but little to they know that "him" will turn into a super cheesy monster. The now monster fetus returns where he was aborted and starts a killing spree as part of his revenge.
My guess is that the producers of this movie knew only the basics of film making : they got low budget, an "original" but cheesy idea, and a resolution. The result is almost amateurish film making but with a heart. The movie is entertaining for the bad reasons. There are some things to make fun of. For example, the fetus morph into a mutant is beyond cheesy. The puppet or whatever looks really horrible. The other problem with the movie is the horrid acting. The direction is just bad but not terrible.
This isn't by any means a must see. I won't even recommend it for b-movie fans or horror fans in general. This is one of those movies that you should only see if it's the last, last option in the forgotten VHS section in a local video store.