If the Moro Reflex in the baby does not go away then the baby or child will retain an exaggerated startle reaction with excessive release of the neurotransmitters, cortisol and adrenaline (the stress chemicals).
The good news though is that for most babies the Moro Reflex does go away eventually on it's own and is nothing to worry about.
The Moro Reflex which is also known as a Startle Reflex in babies is an involuntary motor response that infants develop shortly after birth.
In infants and babies the Moro Reflex or Startle Reflex can cause the infant or baby to suddenly start involuntarily splaying their arms and moving their legs before bringing their arms in front of their body.
Usually the Moro Reflex in babies goes away by the time the baby reaches 3 to 6 months of age but some babies may have the Moro Reflex longer and sometimes it lasts for 12 months to 20 months but that is rare.