Article from babycenter:
Solid foods: What's next?
By now you've probably introduced your 6-month-old to solid food. Many experts say to begin by introducing a semi-liquid mix of one or two teaspoons of baby cereal mixed with formula or breast milk. (Any grain works as a first food, but most doctors recommend rice, which is unlikely to trigger an allergy.) Feed this to your baby after one nursing or bottle-feeding session a day, using a soft-tipped spoon. Over time, increase the amount to a few tablespoons and increase the amount of cereal in the mushy mix. Then add another feeding.
When your baby eats about half a cup of cereal a day, it's time to introduce strained or mashed fruits and vegetables (often labeled "stage 1" on commercial jars). She'll continue to need breast milk or formula until she's 1 year old. Introduce new foods three or more days apart and one at a time, so you can identify any allergic reactions. Check the seal and expiration date on baby food jars and make sure the indentation on the top of the lid (which indicates freshness) hasn't popped out. If you plan to store leftovers, spoon the portion you're going to use into a bowl -- dipping a used spoon into a jar of food introduces bacteria, so it's best not to reuse a jar that your baby has eaten from directly. Toss out any uneaten food from the bowl. Heating baby food isn't necessary, but if you do, make sure it's only lukewarm. A microwave can cause uneven heating and hot spots. Better yet: Let your baby get used to room-temperature food, which saves a step for you.
