USAGE: 1. Open a hole in the nipple before using this. Lease reference the following way: lease remove the small part of the rubber on the top of nipple by a thick needle or depict a cross on the top of the implicit is good if the water in a stable state of drip or trickle by gently squeezing. 2. Pls wash the milk bottle, cap and nipple by warm water before using this. 3. This product is with a special bottle brush which could clean the bottle easily. 4. The bottle is marked with a scale which could be easier to control the amount of drinking to prevent feed your pet too much or too little. 5. The material of nipple is durable material is soft and flexible. This product is safety and environmental protection.