Per my wife who has been breastfeeding my son since he was born, the sign that a baby is done feeding is when he/she unlatches. That's all. A baby may take a break or fall asleep while being latched, but that doesn't necessarily mean s/he's finished feeding. Breast compress when a baby has fallen asleep and when he/she unlatches, you're good to go.
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Familiarize yourself with the cues. Sometimes, the baby accidentally unlatches from a breast and when this happens, try to offer again. If the baby refused, then maybe it's one sign that he/she is really feeling full