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Keep in mind that breastfeeding and bottle feeding are two quite different things. When he is breastfeeding, the power is with the baby. He must turn to the breast, open his mouth and latch on, and suck. With a bottle, he is not in control. The milk is dripping down his throat and he has to swallow or he will drown. To the mother this can seem as though he is *guzzling* it down as though starving. Also, he may *finish* the bottle before his need for sucking is satified, or before he gets the message that he is full. On the breast he can continue to suck, even if he has finished the biggest amount of milk. This is the reason we often suggest not to use bottles in the early days - that it is so crushing for a new mum's confidence.
So I wouldn't worry about her looking hungry just coz of the bottle. And it sounds from the nappies that she's getting plenty from you :)