Can these go in the freezer
The avent natural bottles.
For complete instructions on the use and care of the Avent Natural 4oz Bottle 3-Pack, see the Instruction Leaflet at http://download.p4c.philips.com/files/s/scf690_37/scf690_37_dfu_aen.pdf. The leaflet states that expressed breast milk can be stored in sterilized Philips Avent polypropylene bottles/containers in the refrigerator for up to 48 hours (not in the door) or in the freezer for up to 3 months. The manual also cautions that breast milk must never be refrozen or fresh breast milk added to already frozen milk.