Size:
* Baby Gerbil: Tiny, about the size of a dime or smaller. They'll grow rapidly in their first few weeks.
* Adult Gerbil: A baby gerbil will reach its full size in about 3 months. They are usually 4-5 inches long, excluding the tail.
Weight:
* Baby Gerbil: Will weigh a few grams at birth.
* Adult Gerbil: Adults can weigh 50-100 grams.
Physical Appearance:
* Baby Gerbil: Hairless and pink at birth, with fur growing in quickly. Their ears and eyes are closed initially, opening after about 2 weeks.
* Adult Gerbil: Fully furred, with larger ears and eyes, and a fully formed tail.
Behavior:
* Baby Gerbil: Highly dependent on their mother. They will sleep, nurse, and play in the nest.
* Adult Gerbil: Independent and will show more explorative behavior. They can be playful and social.
Other Factors:
* Age: Baby gerbils are typically less than 3 months old, while adults are older.
* Litter: If you have a litter of gerbils, the smaller ones are likely babies.
Important Note: It's crucial to remember that gerbils are very delicate creatures, especially babies. If you're unsure whether a gerbil is a baby or adult, it's best to consult with a veterinarian or a gerbil expert.