Behavioral problems in infants and young children with spinal muscular atrophy and their siblings: A cross-sectional study

•Behavioral co-morbidities of children with SMA were compared with healthy and children with chronic non-neurological illness.•In infants with SMA, the scale scores of IBQ-R were significantly higher for distress, fear, sadness, and falling reactivity.•For preschool age group, the internalizing problem scores and stress problem scores were higher in the SMA group.•Syndrome scale scores was higher in SMA children for emotionally reactive and anxious domains compared to control groups.