Rebecca Groves, 19, had just walked into the store near her home in Walton, Liverpool, when her waters broke.
Fortunately, quick thinking checkout assistant Philly McCabe turned midwife to help deliver the surprise baby after finding Rebecca in distress in the baby changing room.
Baby Joel was delivered before ambulance workers could arrive, with Philly providing support to Rebecca throughout the birth.
The pair have now been reunited back at the store to give Philly the chance to meet little Joel for the first time since his unexpected birth.
Rebecca was out shopping with a friend when her waters broke.
Philly brought water and towels as they waited for an ambulance to arrive, but as Joel emerged, his umbilical cord snapped.
After a suggestion from the 999 operator, Philly and a customer, Tracy Cowdall, tied the cord back together with black shoelaces from the store.
Neither Philly nor Tracy, who was in the store to buy a temporary tooth filling, had any midwifery experience.
But they're both fans of TV shows like One Born Every Minute and Call the Midwife, which they said helped them bring Joel into the world.
Joel was then given baby clothing from the store to keep him warm on the way to hospital.
When they returned to the store, Rebecca and Joel received a hamper full of £100 in baby goods including clothes, nappies, wipes and bibs for Joel, as well as a box of chocolates for Rebecca.
Rebecca and her son are both healthy and she said she would eventually find the experience funny, although she told the Liverpool Echo: "I didn't really find it amusing at the time."
More on Parentdish: