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This story deals with miscarriage and stillbirth and could be triggering for some readers.
Estelle Dejean and husband Devon were busy parenting their two little ones, Thea and Zion, when the finance industry professional discovered she was pregnant.
"It was a surprise to find out we were having a third baby but even more of a surprise when our obstetrician told us it was baby number three and four!" Estelle told Mamamia.
Watch: A tribute to the babies we have loved and lost. Post continues below.
After a routine scan of the twins showed up an abnormality, the obstetrician referred the couple to a multiples pregnancy specialist at the Mater Mother's Hospital in Brisbane.
"Dr Sailesh Kumar told us that my rare type of twin pregnancy was called a monochorionic monoamniotic (MCMA) pregnancy, meaning that the twins were sitting in the same amniotic fluid and sharing the same placenta.
"We were told it was a very high-risk pregnancy with only about 70 per cent survival rate. Being in the same sac, there's not much room for them to move around, and as the cords are loose, they can become entangled. We were also told about other complications with the umbilical cord and amniotic fluid and that one of them may not survive.