A 6-day-old term newborn comes for weight loss compared with birth weight. And now the weight is 2.37kg, and birth weight is 2.5kg, the mama is exclusively breastfeeding every 1 to 2 hours and believes that breast empties after each feed. How can this best explained?
选项：

A: The infant is not receiving enough milk and the mother needs to breastfeed more often;
B:The infant is not receiving enough milk and the mother needs to supplement with formula;
C:The infant is not receiving enough milk and the mother needs to feed for a longer period of time;
D:The infant is feeding appropriately, and there is no reason to be concerned at this time;
E:The infant is feeding appropriately, and there is no reason to be concerned at this time