Newborn :
Normally born with eyes open.
Head and body : 60-80mm, weight : 30g
Body covered with fine gray hair, tail with dark and grayish bands.
Ear tufts absent.
2d Week :
Able to crawl unsupported
3d Week :
Starts to take some solid food from parents
4th Week :
Leave parents from time to time.
5th Week :
Lap liquids.
6th Week :
Head and body : 120 – 50 mm, weight : 70g
Milk dentition complete
If necessary they can survive on solid food and milk substitutes
7th Week :
Weight : 80g
8th Week :
Head and body : 140-70mm – weight : 91g
9th Week :
Weight : 97 g
10th Week:
Weight: 103 g
11th Week:
Small ear tufts become visible (dark gray).
Weight : 105 g
12th Week :
Independent of parental care.
14th Week :
Ear tufts becoming silvery.
Suckling ended.
17th Week :
Weight : 137 g
20th Week :
No longer on adult back.
22th Week :
Weight : 166 g
28th Week :
White ear tufts
Weight : 174 g
60th Week :
Full sexual maturity reached.