At the beginning of the feeding, your baby's suckling will be shallow and quick. Once the milk begins to flow, the baby's suckling should become deep and slow. At one point there should be a pause and the baby should open its mouth wide. This is when the mouth fills with milk. The longer this pause, the more milk the baby gets.
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The next video shows a baby breastfeeding well.
SampleĀ video from "Breastfeeding : Bringing baby to the breast" fromĀ http://www.videoallaitement.org/english.html