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In page Breastfeeding:

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Breastfeeding is less costly than alternatives, but the mother generally must eat more food than would otherwise be necessary. In the US, the extra money spent on food (about US $18 each week[citation needed]) is usually about half as much money as the cost of infant formula.[1] According to the CDC, breastfeeding mothers need an extra 450 to 500 calories per day compared to their pre-pregnancy caloric intake.[2]