The Moro reflex, or startle reflex, is when a baby suddenly flings their arms and legs out and then pulls them back in, often crying, in response to a loud sound or a feeling of falling. It is present from birth and usually disappears by around 4 to 6 months.
Key takeaways
- Doctors check it during the newborn exam.
- It can briefly wake babies from sleep.
- Swaddling can reduce startling in newborns, but must stop once the baby tries to roll.
When to talk to your doctor
Talk to your doctor if the reflex seems absent, is clearly different on each side, or is still strong after 6 months.
