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Breast milk alone is the ideal food for the first 6 months of life. If you wean your baby before 12 months of age, give an iron-fortified formula. The formula should be iron-fortified to prevent anemia (low blood count). Don't start cow's milk until your child is one year old. Cow's milk does not have the vitamins babies need. There is generally no need to give your breastfed baby water, juice or other foods in the first 6 months.
It depends on the age of the baby and the weather. From birth to about 12 months, baby's milk should be as close to breast milk as possible, therefore I will say, better to give baby warm milk. Above 12 months, I will say between warm and cold depending on the weather. Besides, warm milk is very soothing.