How much food do you feed a baby guinea pig a day?

All you have to do is leave the food in the cage like you do normally. They're like cats, they eat as much as they need to and then stop. They will eat as much as they want and you should let them figure out how much they need. But, if they are getting fat fast then stop feeding them that many treats like veggies and others because that is usually what makes them fat but, if you do stop and they still do not slim down then take the bowl out of the cage at nighttime.