Written by Kristen (My Little Mousery)

A compiled list of facts that anyone can use as a reference for reproduction facts about mice.

Before Breeding:

Average Weight of Adult Mouse: 20g - 60g

Life Expectancy: 1-3 years

Sexual Maturity: 4 - 8 weeks

Full Maturity: 3 to 5 months

Breeding Season: Any time of the year

During Breeding:

Average duration of Female Estrus Cycle: 4 - 5 days

Ovulation: about 12 hours

Gestation Period: 19 - 21 days

After Birth:

Average Litter Size: 8-10 pups

Largest Litter Size Recorded: 32 pups

Average Time of Birth: 10pm to 2 am

Average Weight of Newborn: 1g

Ears Open: 3-4 days

Incisors Appear: 10-12 days

Fur Begins to Grow: 7 days

Eyes Open: 13 - 15 days

Fully Furred: 16 days

Weaned: 3 to 3 1/2 weeks