A 9-month-old infant cannot sit without support, has no pincer grasp, does not babble, and shows no stranger anxiety. Which of the following is the MOST concerning red flag?

• A No pincer grasp at 9 months
• B No babbling at 9 months
• C Cannot sit without support at 9 months ✓
• D No stranger anxiety at 9 months

Explanation

Sitting without support is normally achieved by 6–7 months. Inability to sit without support at 9 months represents a 3-month developmental lag in gross motor milestones and is the most significant red flag, potentially indicating cerebral palsy, hypotonic syndromes, or structural CNS pathology. Pincer grasp normally develops at 9–12 months (not expected yet at 9 months). Babbling should be present by 9 months; absence is also concerning but the gross motor lag is more alarming in terms of severity.

Reference: Ghai Essential Pediatrics, 10th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.