so i Am back to work and i leave at least four 3oz bottles in the frig. with my Husband the day.. LO (8 weeks old) eats about an ounce or ounce and a half every hour to hour an a half... during the evenings that i'm away she eats 3oz in one sitting. usually 2 of those in a 4 hour stretch. how do you know how much she should be eating? what's too much? what is the best way to warm the bottles from the frig?