Thank you for viewing. Target age: 0 to 6 months This baby bottle is made of glass and is hygienic. The nipples have deteriorated, so they have been disposed of. The baby bottles were sterilized by boiling. There are many sterilization methods now, but I used to believe that boiling sterilization was good for the health of children. Please consider this item, understanding that it is a used item. Set of 1 Pigeon hospital-use baby bottle (100ml) and 2 NUK (125ml) bottles, all made of glass. I received these as hand-me-downs and used them for about a month during the newborn period. The NUK bottles seem to be from a while ago, and the current NUK nipples don't fit, but I was able to use them without any problems by attaching nipples from the "Mother's Touch" brand. The squirrel design is very cute and soothing. Thank you.