I’m a new mom and I’m planning to travel with frozen breast milk by car. I’m wondering what the best way to do this is. I need to make sure that the milk stays frozen and safe to use. I’m also concerned about how long it can stay frozen while in transit. What should I do to ensure that the milk is safe and stays frozen? Are there any special containers that I should use? Do I need to keep the milk in a cooler? Any advice would be greatly appreciated!