The Brother Max 4-in-1 Trainer Cup is a specific brand and model of a training cup designed for infants and toddlers. As the name suggests, it offers four different configurations or stages to aid in the transition from bottle feeding to using regular cups. Here's a breakdown of the four functions typically offered by the Brother Max 4-in-1 Trainer Cup: 1. Bottle-Like Configuration: This stage typically includes a soft silicone spout or nipple that mimics the feel of a baby bottle. It's suitable for younger infants who are still transitioning from bottle feeding to cup drinking. 2. Sippy Cup Configuration: As the child progresses, the cup can be converted into a sippy cup with a firmer spout. This stage encourages independent drinking and helps toddlers get used to holding a cup and sipping from it. 3. Sip & Seal Cup: Some models of the Brother Max 4-in-1 Trainer Cup include a "sip & seal" function. This typically involves a spout or straw with a valve that prevents spills when the cup is tipped over. 4. Open Cup Configuration: The final stage involves removing the spout or straw entirely, converting the cup into an open cup. This encourages children to drink from a regular cup, promoting better oral motor skills and coordination. The Brother Max 4-in-1 Trainer Cup is designed to be versatile, durable, and easy to clean, making it a popular choice for parents who want a cup that can adapt to their child's changing needs during the weaning process.