5 Phases manufactures revolutionary hybrid glass baby bottles that provide the healthful benefits of glass AND the protection of “BPA free” plastic. Our glass baby bottles have a unique patented design that features a removable glass insert encased in a translucent protective BPA free plastic sleeve, which protects from breakage. Bottles are manufactured in 4 oz and 8 oz sizes.  Interchangeable, vented silicon nipples in 3 different flow rates are also manufactured.