The moro reflex is noted when the baby does what

The Moro reflex, also known as the startle reflex, is noted when a baby responds to a sudden loud noise or a feeling of being dropped or unbalanced. When this reflex is triggered, the baby tends to react by extending their legs, arms, and fingers quickly. They may also cry, widen their eyes, or arch their back. After a brief moment, the baby brings their arms back in and may cling to the caregiver for comfort and reassurance.

The Moro reflex, also known as the startle reflex, is noted when the baby suddenly extends their arms and legs, throws their head back, and then quickly brings their limbs back in. This reflex is usually triggered by a loud noise, a sudden movement, or a sensation of falling, and is a normal part of a baby's neurological development.