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Fetal arrhythmias are common, and rare cases can lead to significant morbidity and mortality. The incidence of severe cases is about 1 in 5000 pregnancies. Diagnosed in approximately 1-3% of all pregnancies, they typically present with atrial ectopies, transient bradycardia, or tachycardia. Although most fetal arrhythmias are benign, they can result in low cardiac output, hydrops fetalis, and intrauterine death (IUD). These conditions are often detected during fetal anatomical screenings at primary obstetric clinics. Case Report: A primigravida with a gestational age of 37 weeks and 6 days presented for safe confinement. During a non-stress test, the fetal heart rate was not detectable, prompting an immediate obstetric ultrasound. The scan revealed a fetal heart rate of 366 beats per minute (bpm). Immediate consultation with a cardiologist and neonatologist was obtained, and an emergency lower segment cesarean section (LSCS) was advised. Emergency LSCS was done, and immediate Neonatal cardiologist consultation was done. They advised ECG and 2D Echo. ECG has shown tachycardia and 2D echo was normal. The Neonate has 2 episodes of arrhythmia for which injection Adenosine was given. Neonatal cardiologist advised Tab. Propranolol 10 mg need to be diluted in 10 ml of water. This need to be given morning and evening 1.5 ml bd. Conclusion: Persistent fetal tachycardia, although rare, requires prompt recognition and intervention to prevent adverse outcomes. This case highlights the importance of immediate multidisciplinary collaboration and swift action in managing severe fetal arrhythmias. Keywords: Fetal arrhythmias, Incidences, Cardiac output, Hydrops Fetalis, IUD, Neonatal resuscitation, Obstetricians, Cardiologists, Neonatologists.