Yes. Lifefactory glass baby bottles are made from borosilicate glass. Borosilicate glass is known for its superior durability, chemical and heat resistance, and is excellent for use in chemical laboratory equipment and cookware. This allows the baby bottle to go from the freezer to boiling water pot.
When freezing, store the bottle in an upright position. DO NOT FILL TO TOP. Leave a minimum of 2oz/58 ml of open space from neck of bottle to allow for expansion and prevent glass breaking while frozen. See Care & Use instructions for details.