When to newborn mice get there fur?

Newborn mice, called pups, are born hairless and blind. They start to grow fur around 10 days old. This process is called furring and usually takes about a week.

Here's a timeline of key developments:

* Birth: Hairless, blind, and helpless

* Day 10: Fur starts to grow

* Day 17: Furring is complete, eyes open

* Day 21: Weaning begins

Note: These are general guidelines, and the exact timing can vary slightly depending on factors like breed, environmental conditions, and individual pup development.