PS. Don't believe those low carb web sites that claim human breast milk is naturally high fat-low carb and therefore the baby is on a "low carb diet" too and is in ketosis.
per fluid ounce, human breast milk has (per USDA nutrient database):
Total fat 1.3 grams
total carb 2.12 grams
total protein 0.32
A traditional ketogenic diet has fat
gram to carb
gram ratio of 4 to 1. Atkins is a modified ketogenic diet and has a fat gram to carb gram ratio of about 1.5 :1. Clearly, human breast milk does not have a ketogenic fat:carb ratio.