I just took my second to his 9 month, and doctor said after 9 months you can start a little cows milk if you have no dairy issues in your family. I agree, formula may not be necessary, but if so, no biggie. My first I was so afraid to go with formula, my second has had both since around 6 months, although mostly breast milk. Try not to stress, and give a little milk or formula, then nurse when you can....one thing I wish I knew the first time, is to be a little more flexible...a stressed mom is not a happy one! You could try formula or milk and just see what your baby likes...each kid is different (they are just little people I always forget!) Try not get hung up on milk, amounts, etc, and think of all the different foods and liquids your baby will get their nutrition from as a whole group....and you will do fine!