Transitions from breast to bottle and back again have never been smoother with Dr. Brown's Breast to Bottle Feeding Set. Introduce your breastfed baby to a bottle with no hiccups using Dr. Brown's options+ bottles and slowest flow nipples. The paced, slow flow feeding system includes two nipple levels so that you can find the perfect fit for your baby, and the narrow nipple base allows baby to properly engage the entire nipple, just like breastfeeding.