Post, in describing the birth of a two-pound child, mentions that menstruation had persisted during the mother's pregnancy.

Rousset reports a peculiar case in which menstruation appeared during the last four months of pregnancy.
There are some cases on record of child-bearing after the menopause, as, for instance, that of Pearson, of a woman who had given birth to nine children up to September, 1836; after this the menses appeared only slightly until July, 1838, when they ceased entirely.

A year and a half after this she was delivered of her tenth child.

Other cases, somewhat similar, will be found under the discussion of late conception.
Precocious menstruation is seen from birth to nine or ten years.

Of course, menstruation before the third or fourth year is extremely rare, most of the cases reported before this age being merely accidental sanguineous discharges from the genitals, not regularly periodical, and not true catamenia.