This reduces the need to wash bottles, but also helps reduce excess air in the milk which is great when you have a baby with gas issues already. (twiniversity.com)
Tap each pan gently on the counter to remove excess air bubbles, and bake at 350 degrees for 30 - 34 minutes. (flourcoveredapron.com)
Usually, it just means that your baby has learned to eat without swallowing excess air. (kidshealth.org)