The Difrax S-bottle is equipped with a patented valve system at the back of the bottle. Air is necessary to prevent the nipple from creating a vacuum. During feeding, the required air is drawn in through the back, where it circulates above the milk without mixing with it. This prevents your baby from swallowing air and helps maintain the nutrients and vitamins A, C, and E in the milk.
Possible causes of air bubbles in the milk during feeding include:
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Preparation Method: If the milk has been shaken or stirred too vigorously, air bubbles may have been introduced during preparation. We recommend gently stirring the milk or swaying the bottle to reduce air bubbles.
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Valve Function: The valve at the bottom of the bottle might not be functioning properly. For optimal performance, check the valve before each use and open or replace it if necessary. Follow the instructions on how to open the valve at the bottom of the S-bottle. How do I open the valve at the bottom of the S-bottle?
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Feeding Technique: It is possible that your baby may occasionally loosen their suction or let the nipple slip out of their mouth during feeding. This can allow a small amount of air to enter the bottle through the nipple hole, resulting in small air bubbles in the milk. These bubbles generally move towards the back due to the air suction from the valve. Your baby will not drink these bubbles directly. The S-shape of the bottle ensures that the nipple remains fully filled with milk, preventing air from entering. This does not affect the milk.
Tip: Make sure your baby's lips fully wrap around the wide part of the nipple during feeding. This ensures a good seal and allows the tongue to position itself properly under the nipple, making it easier for your baby to hold the nipple firmly in their mouth.