The following sites give some excellent information on rats and reproduction.

A *very* good article on all aspects of raising a litter of rats.
<http://www.ratfanclub.org/repro.html>

In case you run into trouble--here are links to two articles which discuss the care and feeding schedules of orphaned baby rats.
<http://www.ratfanclub.org/orphans.html>
<http://www.rmca.org/Articles/orphans.htm>

This site shows a normal, healthy (though somewhat graphic) rat delivery.
<http://mruud.tripod.com/raisinratsrattery/id9.html>

The following link takes you through the developmental stages of baby rats--hair growth, hearing and vision (good pictures).
<http://hometown.aol.com/RistoRat/ratbabies.html>

This link contains good advice for feeding the ratlings after the intensive first 4 weeks. <http://hometown.aol.com/RistoRat/nutrition.html>

Sarah Shuman's article on socialization of baby rats will help those babies become friendly and confident. <http://hometown.aol.com/RistoRat/social.html>

And last of all, how to tell those baby boys from the girls.
<http://www.uiowa.edu/%7Evpr/research/animal/mp7.jpg>
<http://www.rodentfancy.com/myomorpha/sex.htm>