It is very important to choose a water cup material suitable for babies because it directly contacts the baby's mouth and esophagus. It is best to use the following common baby water bottle materials:

1. Food-grade silicone: Food-grade silicone is a soft, heat-resistant material with high temperature tolerance and good durability. It contains no harmful substances and is healthy and safe for babies. In addition, silicone cups have good anti-fall performance and are a more economical and practical choice;

2. Stainless steel: Stainless steel water bottles are another reliable option because of their excellent corrosion resistance and durability. Stainless steel cups are generally lightweight and do not produce harmful substances. In addition, the stainless steel cup is easy to clean and can resist the growth of bacteria;

3. Glass: Glass is a safe, non-toxic choice that won't leach harmful chemicals into the water. It has good texture and transparency. However, glass cups are relatively fragile and easily broken, so they are not suitable for babies to use by themselves and require adult supervision.

No matter which material you choose for the baby water cup, please make sure that the surface of the cup is smooth, not easy to hide dirt, and there is no metal or plastic residue to avoid damage to the baby's mouth.