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This content is selected and controlled by WebMD's editorial staff and is brought to you by Similac.

From how to hold the bottle to how much to feed, new parents have many questions about feeding. Here are some answers from board-certified pediatrician Renee A. Alli, MD, a fellow of the American Academy of Pediatrics in practice in metro Atlanta.

What's the best way to choose a formula?

Your pediatrician may suggest a formula, or it may be given to you at the hospital. Unless you've talked to your pediatrician about any milk-based allergies or soy-based allergies that you or an older sibling might have, it will be a milk-based formula.

How do you know if you should change formulas?

If your baby has a rash or you see blood or mucus in your baby's diaper, tell your pediatrician. Those could be signs of a milk-protein allergy. If your baby is fussy when you're feeding him, spits up a lot, or has symptoms of reflux (arching his back, fussiness after eating, spitting up with most feedings), those may also be signs you need to change your formula.

How should you switch formulas?

If the symptoms are serious, like blood or mucous in your baby's stool, you would switch cold turkey. If it's a rash or your baby's spitting up or cranky, you can do it gradually. Your child's doctor will help you figure out a plan. 

Is my baby more likely to be colicky with formula?

We don't know the reason for colic, but we know it happens in a baby's first 3 months. It can happen in both breast- and bottle-fed babies.

How much should I feed my baby at each bottle feeding?

Formula-fed babies usually drink about 2-3 ounces (60-90 ml) every 3-4 hours for their first 2 months. By 4-6 months they drink about 6 ounces and are up to a maximum of 8 ounces by the time they're 6-8 months old. 

All babies drink different amounts, so check with your pediatrician during well visits to make sure your baby is gaining the right amount of weight. One tip: Wake your newborn to eat in the first month if she sleeps more than 4 hours.

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