It's really too bad that all a movie has to do to be considered for a sequel is make money. Baby Geniuses made $27 million in the US in 1999, and with its estimated $13 million budget, it was sure-fire sequel fodder. Doubling your budget in gross receipts is probably the single highest achievement in Hollywood these days.
Amazing the movie made that much. It's #29 in the IMDb Bottom 100, which of course is not a scientifically valid survey of all moviegoers. But I think it's indicative of the way the movie was truly viewed by the same public which shelled out all those millions to encourage the sequel.