I’ll go back and try again from my save point, which ought to be accessible to all three endings. I got the silver bullets as well as the scissors.
I went back to my save point and finished all three endings. The "bad" ending was the one I reached originally. I already knew of the path to the "neutral" ending, but hadn't played it until now. The good ending was a bit trickier to achieve, but I already had the inventory I needed, so once I went back into town and started revisiting some locations I had been to already, I was able to save the child. That ending was much more satisfying! (but even without the best ending, the game was already successful in my estimation)