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en.wikipedia.org/wiki/Brown_rat

The Brown rat, also referred to as common rat, street rat, sewer rat, Hanover rat, Norway rat, .... Females are able to produce and raise two healthy litters of normal size and weight without significantly changing their own food intake. However ...

www.peteducation.com/article.cfm?aid=889

In rats, the average litter size is 6-13 pups. The first sign is a bloody discharge from the vagina. Next, the contractions will cause her to stretch out while her sides ...

www.afrma.org/brdstf_lrglttrs.htm

What is the normal litter size for rats? Do they always have this many?! Is the mother rat going to be able to care for 16 babies? What will I need to do for her?

discovermagazine.com/2006/dec/20-things-rats

Dec 7, 2006 ... Jack Black the royal rat catcher, Jacko the world-champion rat killer, rats ... females can only have up to 4 litters in a life time, and the litter size ...

www.quora.com/How-many-babies-do-rats-have-per-litter-How-many-litters-can-they-have-in-a-year

Mammals typically do not have litters that are greater in number than their number of nipples. Rats have 12 nipples, and I believe the average litter size is...

www.ncbi.nlm.nih.gov/pubmed/17089989

J Am Assoc Lab Anim Sci. 2006 Nov;45(6):35-9. Fenbendazole treatment and litter size in rats. Johnston NA(1), Bieszczak JR, Verhulst S, Disney KE, ...

www.merckvetmanual.com/all-other-pets/rats/breeding-and-reproduction-of-rats

The usual litter size is 6 to 12 pups. When baby rats are born, they are deaf and blind. The cage should be kept in a quiet place and the litter should not be ...

www.animalhospitals-usa.com/small-pets/mice-and-rats/mice-rat-reproduction.html

Sexing: Sexually mature mice and rats must be properly paired to breed ... Litter sizes average 10-12 pups, though it is not unusual for a female's first litter to be ...

understandingpetfancyrats.com/2015/09/14/how-many-babies-can-a-rat-have

Sep 14, 2015 ... Having a litter of rats can be a very exciting experience; but very nerve wrecking for the first time ratty grandparent who doesn't know what size ...