Startle reflex
Abbreviation: Moro reflex
The startle reflex, also called the Moro reflex, is a normal involuntary response present in all healthy newborns. When your baby is startled by a sudden noise, movement, or the sensation of falling, they will throw their arms and legs outward, open their hands, then quickly bring their arms back toward their chest. It is a sign that your baby's nervous system is working correctly. The reflex can be triggered easily in the early weeks and may wake a sleeping baby. It typically becomes less pronounced around two to four months as the baby's brain matures, and disappears by around six months.
What This Means for You
Understanding Startle reflex is an important part of your newborn journey. In your baby's first year, you will hear this term from your paediatrician and in parenting communities. Knowing what it means helps you respond quickly and confidently.
Explore our Baby hubGood to Know
Swaddling can reduce how often the startle reflex wakes your newborn during sleep. If the Moro reflex is absent, very unequal on both sides, or still strong after six months, mention it to your paediatrician at your next KKH or polyclinic developmental check.
Related Terms
Source: https://medlineplus.gov/infantandnewborncare.html
Always consult your healthcare provider for personalised advice.
Free Tools for Singapore Parents
Put your knowledge into action with our free calculators and trackers.