Amanda Phizacklea, 37, from Barrow, Cumbria, completed the set when she gave birth to baby Eva on June 18 - a Wednesday.
Her other children are Lyndsey, 20, born on a Friday (19.11.93), Rebecca, 19, born on a Sunday (11.6.95), Ben, nine, born on a Thursday (1.7.04), Jack, seven, born on a Tuesday (11.7.06), Lexi, four, born on a Monday (2.11.09), and Sam, two, born on a Saturday (14.1.12).
Amanda says each of her children match the characteristics described in the traditional poem Monday's child.
"It's really strange. The poem states says Wednesday's child is 'full of woe,'" she said.
"I'm hoping Eva's not going to be miserable but she can pout already so maybe she will be a bit of a misery guts."
It was during a conversation with her mother-in-law a couple of weeks before Eva was born that Amanda realised her six children had been born on different days and that the only one missing was a Wednesday.
Eva was born at 10.45pm and Amanda said she joked with her partner Steve, 43, that she would have to push the baby out quickly, as Thursday was fast approaching.
"When I was in the hospital I saw it was getting closer to midnight so I made a concentrated effort to push her out so we didn't miss the deadline," she said.
"I said to the midwife, 'We have to push her out before midnight to have a Wednesday baby.' I thought she was going to end up being born on Thursday morning, but we made it in time with an hour to spare."
Amanda describes herself as 'a bit of a numbers person', so she decided to find out what were the odds of having seven children all born on different days of the week.
The daughter of a friend worked out that there is an 823,543 to one chance of that happening.
Monday's child (author unknown)
Monday's child (Lexi) is fair of face,
Tuesday's child (Jack) is full of grace,
Wednesday's child (Eva) is full of woe,
Thursday's child (Ben) has far to go,
Friday's child (Lyndsey) is loving and giving,
Saturday's child (Sam) works hard for a living,
But the child who is born on the Sabbath Day (Rebecca) Is bonny and blithe and good and gay.