A 14-month-old girl had experienced sudden episodes of breath-holding and spasms of the trunk and limb muscles, leading to cyanosis and loss of consciousness since 3 months of age. Her clinical features and electromyography suggested Stiffman syndrome, and her response to high-dose diazepam and baclofen confirmed the diagnosis. Stiffman syndrome is a rare entity, rarer still in childhood. This is the youngest case of sporadic Stiffman syndrome reported in literature. Distinguishing Stiffman syndrome from similar conditions such as Schwartz-Jampel syndrome or neuromyotonia is important because administration of GABAergic agents (valproate, baclofen, diazepam) elicits a good response.