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In page African pygmy mouse:

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The African pygmy mouse reaches breeding age at about 6 to 8 weeks. Pregnancy lasts for around 20 days and the litter of about three young is born blind and hairless. Average weight of puppies at birth is 0.8 g (0.028 oz)[3] Their eyes open after 2 weeks, and weaning is complete after 3 weeks. The lifespan is about 2 years, although individual specimens have been reported to live over 4 years in captivity.[citation needed]