Mango will be fine if she has her babies when you're not home, because it's best for the baby (babies) to get over the shock of coming out in peace and quiet with their mother. YES you will need to separate Millie and Mango because Mango may become defensive and attack Millie! Mango most likely will not die. The baby (babies) will get food and milk from the mother but after a week or less they will begin to eat regular guinea pig food (pellet feed, timothy hay, water) but about the hay: Switch from Timothy hay to Alfalfa hay because Alfalfa hay is made specially for pregnant mothers and growing babies. After 21 days separate the males from the females. The female(s) can stay with the mother. If she gives birth to more than one, then if the males fight you'll need to separate them. You can hold newborn guinea pigs but only for 2-3 minutes. NEVER force him/her/them away from the mother, especially if the mother was nursing or grooming him/her before. Give the mother more water and veggies than usual.
~proud owner of 7 guinea pigs!
~proud owner of 7 guinea pigs!