The babies weigh a total of 15 pounds. Their father says he's physically ready for his growing family but psychologically he's not.
Mother's Day is on Sunday and the family says they received an early blessing.
"This is the best mothers day gift of all," said Amy Lambert, mother of quads.
Amy Lambert gets emotional when she thinks about her newest little bundles of joy: Ava, Katlyn, Maggie and Finnigan.
She and her husband Peter have been preparing for this day but its still overwhelming.
"We went back in for a second ultrasound and there was the one little heart beat, then there was two and then all of sudden, oh you got three. I'm like, okay, triplets will be okay, no problem. And then they said there's a fourth. I told my wife, 'I thought you said twins,'" said Peter Lambert, father of quads.
The babies remain in the neonatal intensive care unit at Advocate Good Samaritan.
The quads were the first born there in the hospital's 33 year history. They were delivered by C-section, eight weeks ahead of schedule.
"We felt that the babies risk in uterum were greater than being outside," said Dr. George Banuelos, obstetrician.
Doctors say the delivery was smooth and much of the credit was given to their mother. The 29-year-old dental hygienist has been described as a perfect patient who did all the right things during her pregnancy.
"She ate carrots,yogurt. She said she wanted to eat healthy for her babies," said Dr. Vibha Thaker, neonatal intensive care director.
"She did awesome. I'm so proud. She's really strong," said Peter Lambert.
But Peter Lambert says the real work begins and he believes it wont set in until all the babies are home.
"We turned our dining room into a second nursery upstairs and downstairs, cribs everywhere for the babies," said Peter Lambert.
They already have a two-year son named Henry. His dad said he met the babies then he wanted to go play with his ball.
Doctors say the babies wont go home until they are ready. They want to make sure they can swallow.