Deciding which type of formula to buy is up to you. The ready-to-use form is more expensive, but also the most convenient, since you don't have to worry about adding water. However, it can be heavy to carry, as are the liquid concentrates that you mix with water. The lightest and cheapest is powdered formula, which is also handy for traveling. Be assured that when mixing formula, water straight from the tap or a home filter is just fine; bottled water offers no advantages, and isn't recommended since it doesn't always have teeth-protecting fluoride.
By month two, baby will be drinking 680g to 900g of milk a day. Ignore the old advice to add rice cereal to formula—it changes the nutritional balance of formulas. However, if the pediatrician thinks your baby could use a thicker formula, he may suggest a formula with an easily digestible rice starch added, and the nutritional content is like other infant formulas.
Once baby starts on solid foods—usually somewhere between month four and six, depending on your pediatrician's advice—you should be careful to bottlefeed on demand. That means paying careful attention to signals that your baby is hungry for formula, and not encouraging more than is wanted or needed. By this time, hopefully your infant is beginning to sleep for six or seven hours straight at night, eliminating the need for round-the-clock feedings.
Your pediatrician will probably let you know when to start weaning baby from the bottle. Some doctors prefer that you switch baby to a sippy cup at, if not before, the first birthday; others are more lenient. You can still serve baby formula in a sippy cup until it's time for regular whole milk, but again, that should never be before the first birthday.
Our parenting advice is given as suggestions only. We recommend you also consult your healthcare provider, and urge you to contact them immediately if your question is urgent or about a medical condition.