Breast-feeding and tracking calories

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Hi! I am a new mom and I would like to know if and how you add breast-feeding into your calorie intake on the tracker (I don't think that is one of the things you can in-put). I know that moms who breastfeed need to eat about 300 extra calories, so any ideas on how to figure this in? My calorie needs without breastfeeding would be about 1300, with a weight loss goal of about 2 pounds per week.