Mouse Pup Appearance by Age (2024)

Day 0

• Blood red
• Possible milk spot

Day 1

• Lighter color red
• Milk spot present

Day 2

• Ears appear as nubs
• Milk spot present

Day 3

• Ear flap starting to come away from head (one or both)

Day 4

• Ears fully developed, completely off head, some starting to go towards back
• Increasing skin color

Day 5

• Ears are fully back
• Skin appears much thicker with more color density to skin

Day 6

• Milk spot is disappearing or gone
• Colored fuzz appears behind ears or on neck

Day 7

• Colored fuzz starting to cover pup

Day 8

• Belly begins to show fur

Day 9

• Fur is now thicker
• Females may show nipples (there are five pairs of mammories)

Day 10

• Fur growth is complete
• Pups are more active

Day 11

• Teeth are beginning to erupt
• Eyes start to open

Day 12

• Eyes are open
• Pups begin to nibble solid food

Day 13

• Pups increase solid food intake

Day 14

• Pups increase in weight and size, eating more solid food