A Queensland mother gave birth to four naturally conceived identical girls in Brisbane on Monday [1, 2].
The birth is considered one of the rarest in the world because the quadruplets are identical and shared a single placenta [2, 3].
Jenitar Sau Na'amoana, 34, delivered the infants in a medical event described as having a probability of one in 15 million [2]. While multiple births are not uncommon, the specific biological configuration of these infants, known as monochorionic, is extremely rare when occurring naturally [3].
Medical professionals said that the girls all share the same genetic material and developed within the same placental environment [1, 3]. This level of identicality in quadruplets is significantly less frequent than fraternal multiples or identical twins.
Na'amoana's family has doubled in size following the arrival of the four girls [3]. The birth is likely a first for Australia in terms of naturally conceived identical quadruplets sharing one placenta [2].
Health officials in Brisbane monitored the pregnancy closely to manage the risks associated with a single placenta supporting four developing fetuses [1, 2]. Such cases require precise medical intervention to ensure the equitable distribution of nutrients, and oxygen to each infant throughout the gestation period.
“The birth is considered one of the rarest in the world.”
This birth represents a significant medical anomaly. Most identical multiples result from a single fertilized egg splitting into two; for a single egg to split into four and remain supported by one placenta without the aid of fertility treatments is an outlier in reproductive science. This case provides a rare opportunity for clinicians to study the limits of placental efficiency and fetal development in extreme monochorionic pregnancies.
