Mayborn USA has recalled more than three million of their spill-proof sippee cups.
The recall affects five different types of the Tommee Tippee Sippee cup.
All of these cups have a removable valve. When the cup is is not cleaned properly, it can develop mold.
The consumer product safety commission says that 68 children have gotten sick using the cup.
In February, parents created a social media storm after noticing the mold. The company is replacing the cup for free and are currently working on launching a new cup design.