I have been exclusively pumping for 6 months and have had an oversupply that I have been freezing. It was my understanding that this milk would last in a chest freezer for 12 months, and my hope was to eventually have enough milk stashed away that I could quit pumping as it is very painful for me. Now that I am about to start rotating this stash, I have read information from LLL that seems to indicate that the older milk might not be good for my son because it was pumped when he was younger? The oldest milk in my freezer was pumped 4 months ago. Is it ok to feed to him?