Can Breastmilk go bad if it get frostbite from the freezer?

I would just throw it out. I wouldn't take any chances. Also, try breastfeeding more to stimulate your body to make more milk. Pumping slows it down because your brain isn't getting that mother-baby connection during the day when you are not breastfeeding. There is a tea you can get at health food stores that helps milk production as well.

Breast milk has a yellow tinge to it. This can vary, depending on your diet. If the milk has freezer burn, dispose of it. Otherwise, it's fine.

If you are pumping more than you are actually feeding, the milk supply production will slow down. Try nursing the baby as much as you can. And make sure you are drinking plenty of water.

Yes if its not stored correctly it can get freezerburnt. The yellow color is pretty normal though. Buy the special breastmilk bags at the store.

To get your supply up you need to breastfeed more. Using a pump is not natural so your body doesnt think it needs to keep producing. When you nurse the baby directly your body can sense it and will keep making as much milk as the baby needs. It's sad to say but working mothers who try to keep breastfeeding usually fail and just go to formula.