how long does it take to grow out a pig
Growth. Guinea pigs grow very rapidly, and will double in size to around 15-20 cm (6-8 inches) after just 8 weeks. After this point their growth will slow somewhat, but they will still get significantly larger in a fairly short period of time, reaching around 20-25 cm (8-10 inches) after 16 weeks.t birth, a guinea pig will generally measure around 8-10 cm (3-4 inches). You should expect some natural variation in size between the animals in a litter, with some bigger than others. The number of pups in the litter also has an effect on how big each baby is-a larger litter will tend to produce smaller offspring.