4 x First Years Soft Spout Trainer Cups

1 of the 2 cups that was opened has been tried with no success and the other 2 were never opened. We are experimenting with different sippy cups for my granddaughter. The one that was tried was put in the dishwasher so it was sterile cleaned. The other in the opened package was never used. The new ones in the package were also never used and are brand new.