Please read the profile! Microwave safe: Yes, Dishwasher safe: Yes [About Sterilization] Boiling sterilization: Yes, Microwave sterilization: Yes, Chemical sterilization: Yes, Sodium hypochlorite solution: Yes There are protrusions on the bottom, so you can mash and feed baby food! There are no stains, but it is a used item, so please consider and purchase if you understand. I also have women's, kids', and baby items for sale. Please take a look♪ Thank you for viewing! If you have any questions, please feel free to contact me. Thank you!