The sensation of your baby "shivering" inside you is likely due to normal fetal movements, specifically their startle reflex.
Here's a breakdown:
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Fetal Movements: As your baby develops, you'll feel various movements. These can range from gentle flutters to more pronounced kicks and jabs.
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Startle Reflex (Moro Reflex): According to available information, a sudden "shaking" sensation can be caused by the baby's own startle response. This is a normal reflex in babies.
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Hiccups: You might also be feeling the rhythmic movements of your baby hiccuping, which are also normal.
In summary, the "shivering" feeling is most likely a normal part of your baby's development and movement patterns within the womb, particularly their startle reflex.