This Dr Brown's bottle is a 4 ounce size with natural flow size 1 slow flow nipples. Anti colic system. #1 recommended by Pediatricians. Breast like nipple shape with natural flow that goes at your baby's pace. This bottle is new and comes in a plastic sleeve. No other packaging. Pet friendly home. Dr Brown's Glass bottle natural flow anti colic pediatrician recommended baby feeding gift breastfeeding bottle