Superfetation
👶 When a Woman Gets Pregnant… While She’s Already Pregnant
It sounds impossible — but it’s real.
A woman conceives a baby, begins her pregnancy… and then, days or even weeks later, conceives another.
The phenomenon is called superfetation — and it breaks nearly every rule of human biology.
Normally, pregnancy shuts everything down. Ovulation stops, hormones block new implants, and the uterus seals itself off. But in incredibly rare cases, that system fails.
Another egg is released. Another fertilization happens.
And a second embryo begins to grow in a womb that’s already occupied.
Doctors say the number of confirmed cases can be counted on two hands worldwide.
Sometimes it’s spotted on an ultrasound — when one fetus is growing faster than the other.
Sometimes, the truth is only revealed at birth: two babies, born minutes apart… yet conceived weeks apart.
It’s not always dangerous, but it’s one of medicine’s greatest balancing acts — managing two pregnancies at two stages, inside one body.
Superfetation reminds us of something modern science often forgets:
The human body still holds mysteries that even nature doesn’t explain easily.
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