Hello, From the given details, I consider the baby was born with no complications at birth and is doing well. Let me give you a slight insight into what this shaking could be, the term jitteriness refers to tremors in newborns. It is the representation of an exaggerated startle response. It is often confused for seizures (also known as convulsion and fits), which naturally unnerves the parents. It is the most common involuntary movement seen in infants, which disappears completely as they mature. The neuro-development of the babies with no other overt neurological sign but tremulousness is generally good, especially when there is no history of complications during pregnancy, or immediately before and after birth. Involves jaw and limbs. Jittering is easily initiated in newborns by external stimuli such as handling the baby or loud noise. It can be easily stopped by: 1.) Gentle flexing (bending) of the affected limb. 2.) Just holding the limb firmly and reassuringly. 3.) Initiating the baby s sucking action also stops the jittery movements. The tremulous movements are most frequently seen during the first few days of life in normal mature babies. It may extend throughout the neonatal period. It usually resolves spontaneously by two months of age. But some infants, with no neurological compromise, may continue to be tremulous till seven to nine months of age. If you notice any other developmental delay in baby or symptoms getting worse over time, kindly see a doctor. Go for regular postnatal check-up s and for now only observe the baby. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Ayesha Shareef