what age can a guinea pig eat
1 Alfalfa Hay-Only give to pregnant, nursing, or young guinea pigs under 6 months of age. 2  Alfalfa hay is too rich for adult guinea pigs, and in excess can lead to health problems.3  Botanical Hay-This hay has a great variety of grass and dry flowers, which offers different flavors for guinea pigs to enjoy.resh Fruits and Vegetables. Guinea pigs should eat about 1 cup of vegetables each day. Fruit should be given once or twice a week, and limited to 1-2 tablespoons per 2 pounds of body weight. Remember to rinse all fruits and vegetables thoroughly.