It is always good for new born. The most wondering part is that its composition change as baby grows. She can get all nutrients from breast milk. You can feed iron fortified formula food at this early stage if you are unable to breast feed. But don’t give water, juice or cereal at this time. The few drops of very first milk are creamy, yellowish colostrums. Colostrums improve the immune status of infants. All types of immunoglobulin are found in breast milk. Secretory IGA, a type of immunoglobulin is found in high amounts in breast milk throughout the first year. It protects the ears, nose, throat, and the GI tract. An iron-binding protein Lactoferrin is found in human milk, but is not available in formulas. It limits the availability of iron to bacteria in the intestines, and alters which healthy bacteria will thrive in the gut. It has a direct antibiotic effect on bacteria such as staphylococci and E. coli. Breast milk contains Lysozyme (a potent digestive ingredient) at a level thirty times higher than in any formula. It strongly influenced the bacteria that inhabit the intestinal tract. Breast milk specifically encourages the growth of Lactobacillaceae, which are helpful bacteria that inhibit many of the disease-causing bacteria and parasites. Carnitine is present in both breast milk and formula, but the carnitine in breast milk has higher bioavailability. Carnitine is necessary to make use of fatty acids as an energy source. DHA & ARA, the main long chain fatty acids which are present in breast milk are important structural components, particularly in the substance of the brain and the retina. Some formulas have this component but not all. Babies who are breast fed are less likely to have colic, upper respiratory infections, ear infections, constipation, asthma or allergies.