Child spacing: as old as mankind.
Jelliffe
D B
DB
Jelliffee
P E
PE
D001721:Birth Intervals; D001723:Birth Rate; D003710:Demography; D005193:Family Planning Services; D005298:Fertility; D007774:Lactation; D011153:Population; D011157:Population Dynamics; D011388:Prolactin
D011388:Prolactin