Case: A five-month-old infant girl was brought to her family physician after a family friend expressed concern that she was unable to raise her upper body when lying prone. Her parents stated that she had made no attempts to roll over, rarely moved her legs and made no attempts to push with her feet when held upright. She put toys into her mouth using both hands but did not reach farther than 10 cm for objects before her. She laughed and interacted with those around her and became excited at the sight of food. She breastfed well and seemed to have tolerated the recent introduction of rice cereal without coughing, choking or vomiting.
She often squealed and seemed to respond to her name. No loss of milestones was reported. Physical Examination: On examination, the infant looked well, with no dysmorphic features. Height, weight and head circumference were between the 75th and 90th…
