What is the size of guinepigs when born?

Guinea pig pups are typically born weighing around 75 to 100 grams (about 2.6 to 3.5 ounces) and are roughly 8 to 10 centimeters (3 to 4 inches) long. They are precocial, meaning they are relatively mature and mobile right after birth, often furred with their eyes open. This rapid development allows them to start eating solid food within a few days.