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American Fancy Rat & Mouse Association

Baby Mouse Development from Birth to 5 weeks
By Karen Robbins

newborn
Newborn. They are bright pink and you can see they will have black eyes. Their eyes and ear canals are sealed. The light spot on their left side is a tummy full of milk.		 1 day
1 Day. The babies are already starting to show some pigment.		 2 days
2 Days. The babies are showing more color pigment and have clearly grown in size and weight.
3 days
3 Days. Each day more pigment shows through.		 4 days
4 Days.		 5 days
5 Days. They are starting to get some peach fuzz hair. These are all Silver Dove.
6 days
6 Days.		 7 days
7 Days (1 week).		 8 days
8 Days.
9 days
9 Days.		 10 days
10 Days.		 11 days
11 Days.
12 days
12 Days. They opened their eyes today.		 13 days
13 Days.		 14 days
14 Days (2 weeks).
15 days
15 Days.		 16 days
16 Days.		 17 days
17 Days.
18 days
18 Days.		 19 days
19 Days.		 20 days
20 Days.
21 days
21 Days (3 weeks).		 22 days
22 Days.		 23 days
23 Days.
24 days
24 Days.		 25 days
25 Days.		 26 days
26 Days.
27 days
27 Days.		 28 days
28 Days (4 weeks). They are weaned from mom and pet shop mice will need to be separated by sexes at this age.		 29 days
29 Days.
30 days
30 Days.		 31 days
31 Days.		 32 days
32 Days.
33 days
33 Days.		 34 days
34 Days.		 35 days
35 Days (5 weeks). The big English Show mice will need to be separated by sexes between 5 and 6 weeks of age.

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Updated March 30, 2015

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