Three of the sisters live in the Chicago area. A fourth lives in California.
On Friday, Leslie Tazos, 24, of Stone Park gave birth to a girl. Her sister, Saby Pazos, 29, of Bellwood, also gave birth Friday-- to a boy. On Saturday, another sister, Lilian Sepulveda, 27, of Franklin Park, gave birth to a girl.
A fourth sister, Heidi Lopez, who lives in California, gave birth to a boy on Monday.
That's four babies-- two boys and two girls-- within four days for four sisters.
Family members say the women didn't plan the timing. Obstetrician Dr. Jean Alexandre, who delivered the three Chicago area babies at Westlake Hospital in Melrose Park, calls the births "very unusual but wonderful at the same time."