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In Spain. It's been a nice discussion, I do disagree with the statement of you know what goes into a baby with formula. At the end of the day weight gain is the best indicator not to mention the problems of formula fed babies being more prone to sicking up feeds (which makes it hard to 'measure' how much they get).

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You can use weight (output) in both cases. But with formula, you also have a good idea of what the input is. Later on you can pump breast milk to get a better idea of input, but that doesn't work well at the beginning.

If you have a colic baby, all bets are off, of course.

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