Once your baby reaches a certain age, she can eat some solid foods in addition to taking formula in a bottle. It is recommended, however, that you offer solids before the bottle, says Dr. Jane Scott, a Colorado-based pediatrician and neonatologist. “If they drink formula first, they fill up on milk and then have little appetite to try solid foods,” she says. When introducing solids, allow your child time to adjust to new food. A good first food is rice cereal mixed with either formula or breast milk. Your baby should be ready to venture into solids at approximately 6 months of age, but not before 4 months, says Scott. As your child gets used to the consistency of the solids, you won't need to thin them as much.