But we doubt they'd have expected that two and a half years later, they'd have another baby on the same day!
Claire Ottaway, 33, and Michelle Noble, 29, first met at Scarborough Hospital, in North Yorkshire on 8 March, 2012.
They were put next to each another in hospital beds when Michelle, an occupational therapist, gave birth to son Henry just hours before Claire's baby Ben arrived.
Fast forward to this year and they've found themselves in the same situation again!
Daughters Isabel and Evie arrived in the world on 30 July, after doctors changed teacher Claire's caesarean date.
Claire, who also has Jake, five, said: "We couldn't believe it. It is so lovely that we have been able to share this whole journey… We have really helped each other through."
Michelle added: "Now our children are going to be good friends too. The boys already get on great together."
According to bookmakers William Hill the odds of giving birth on the same day for a second time is a huge 270,000–1.
At least they can't forget the other's birthday now!
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