28/08/2025
🤯Fetal ejection reflex vs Fergusons reflex🤯
Well, this is a bit of a niche one, but one that nevertheless niggles me now and then (much like Rachel Reed who has also been bothered by this I think 🤣).
I think we are mistaking the Fergusons reflex for FER . The two are not the same.
🤯Currently, particularly in the physiological birth world, I see a lot of talk about having experienced FER, when the narrative of what happened describes a normal Ferguson’s reflex, working impeccably.
🤯So what is the difference?
Well, the Ferguson’s reflex is a normal reflex during (usually physiological) birth, but can also happen during interfered with births.
It is created by a feedback loop of oxytocin release creating contractions, then causing descent of the baby through the birth canal, which puts pressure on the tissues of the birth canal and pelvic floor, which in turn stimulates more oxytocin release and contractions.
Also known and the utero-pituitary reflex, it creates that juicy involuntary urge to push the baby out, completely involuntarily, and it often feels like ‘our body is doing it all by itself’.
Which it is doing I suppose!
It’s a normal part of birth and can cause a swift, sometimes overwhelmingly involuntary ejection of the baby.
It CAN also take a long time, depending on lots of factors.
The key factor is the feedback loop of pressure, oxytocin release, more pressure and the triggering of expulsive efforts that can’t be resisted.
🤯The FER (fetal ejection reflex) is more of a protective reflex when danger lurks, and our body needs to expel the baby quickly so that we can grab the baby and escape.
On the flip side, a similar physiological response can also SLOW labour so we can run away while still pregnant.
The theory is that it is triggered by a sudden surge of adrenaline and catecholamines and was coined by Michel Odent as a theoretical physiological reaction to fear and danger.
🤯I think I have only seen a true FER once, maybe twice. Both times happened after a big surge in fear/adrenaline/catecholamines.
🤯But swift, involuntary baby expulsion in normal and hopefully protected birth space —-> Fergusons reflex 👍🏻