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Hi I'm Dr. Roy Benaroch with Pediatric Physicians PC and we're here at about.com to talk about bottle feeding in newborns. What are the best bottles parents should use.Families that are bottle feeding, there are a big variety of bottles and styles to choose from. Though there are a lot of marketing claims about some bottles reducing gas or being more like natural feeding, there really isn’t much independent evidence that any of the newer designs are any better than traditionally shaped bottles. Some parents are concerned about certain chemical plasticizers, called BPAs, used in bottle production. There have been some conflicting evidence about whether these chemicals pose a health problem. In any case, they are no longer used in baby bottles, though they may still be present in older bottles that have been bought years ago. Some parents have used glass bottles instead, but they’re heavier and break more easily. Bottles are sometimes designed to use drop-in, disposable bags or liners. This can save some of the work of cleaning the bottles, though some people are concerned about the environmental impact of throwing away the bags. In addition to the bottles themselves, there are different shapes of nipples and different nipple sizes. The number refers to the speed of the flow through the nipple—usually, a higher number allows quicker flow, and for most babies the higher-numbered nipples are needed as babies grow bigger. However, the shape and size of the nipple really depends on the feeding style and preferences of the baby. There are no hard and fast rules about what shape or size is best at what age. Parents will have to experiment with different kinds until they find one that’s most suitable. Any nipple that’s becoming hard, cracked, or discolored should be discarded. Thanks for watching for more information, visit about.com.  
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