Answer:

Introduction:
The animal described in the question is one that lives on trees, has a trail, and makes a sound called chatter. Based on these characteristics, we can infer that the animal being referred to is a squirrel.

Baby of a Squirrel:
The baby of a squirrel is called an infant. The term "infant" is commonly used to describe the young ones of various animals, including humans. It is the appropriate term for a baby squirrel as well.

Explanation:
Characteristics of a Squirrel:
1. Lives on trees: Squirrels are arboreal creatures, which means they spend a significant amount of their time on trees. They build nests called dreys in the branches of trees, where they live and raise their young.

2. Trail: Squirrels are known for leaving a trail or path behind them as they move. This trail is created by their constant movement and exploration of their surroundings.

3. Chatter: Squirrels make a distinct sound called chatter. This sound is a series of high-pitched, rapid vocalizations that they use to communicate with each other and express various emotions such as alarm, excitement, or aggression.

Baby Squirrels:
The baby squirrels are born blind, hairless, and completely dependent on their mother for survival. They are called infants or baby squirrels. The term "infant" is commonly used to refer to the young ones of various animals, including humans. It is a general term that indicates the early stage of life in any species.

Conclusion:
In conclusion, the baby of the animal described in the question, which is a squirrel, is called an infant. The term "infant" is a general term used to describe the young ones of various animals, including squirrels. It is appropriate for baby squirrels as they are born completely dependent on their mother and require care and nourishment to grow and develop.