When and Why is Pregnancy Spacing Important?

How long should a woman wait to get pregnant after a C Section? Why wait? And does it matter (medically) how quickly a healthy woman gets pregnant if she hasn't had a C Section? 

Note: If a woman wants spacing of over a year and doesn't know whether breastfeeding will work for her, she should consider an alternate method of birth control. (After a CS, she should pick a more reliable method, regardless.)

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