We have a small litter of three now that is at about the same age. Maybe they won't need milk at all if you have pellets but they may need it for another week. A bowl of water with food
No offense but a total waste of time and energy. Just bury the stalks in rich dirt with worms and microbes and they will break it all down for you. Start a compost pile or get some rabbits and chickens. The dirt in my chicken coop has about 100 worms per shovel full. That is a scary amount but...