We use Medela bottles that came with our breast pump. One thing we don’t like about the Medela bottles is that they deform under heat — like when you’re warming milk to feed to your baby. We’ve learned how to un-deform the bottles. We also switched to Ameda and Evenflo bottles for cold storage. They don’t deform when heated.
I’m assuming you’re trying to un-deform ( restore ) a bottle full of milk, rather than an empty bottle. An empty bottle is easy — open it, toss it into boiling water, blow into the hot bottle, rinse in cold.
- Heat the bottle up to the same temperature as when it deformed. You can also use boiling water, but that’s overkill. You use the hot water for avery short time — just enough to heat the bottle surface, not the milk inside. If the bottle has deformed, the milk inside is too hot to feed to baby!
- Open the lid a little — not al the way, or you risk spilling milk — just enough to let some air in.
- Gently put pressure on the sides of the dents. They’ll slowly move, then suddenly “snap” at the end.
- immediately rinse the sides with cold water. You can also put it into a cup of cold water. Be careful not to let the water enter the bottle.
- Remember, the milk is too hot to feed to baby, and will re-deform the bottle if you grab it hard. Do not put pressure on the bottle, and wait until the milk has cooled to a reasonable temperature. The bottle will be fine then.
- We’ve found the bottle is not damaged by being de-formed. Once you restore it and cool it back to room temperature, it will work just fine. It will de-form whenever it gets too hot.