What is a concerning behavior for a seven-month-old?

At seven months old, the developmental milestones generally indicate that an infant should be able to sit up with support, if not independently. While every child develops at their own pace, the inability to sit up at this age may suggest a delay in motor skills that could be concerning. Sitting is a key milestone as it demonstrates core strength and coordination, which are essential for future movements and overall development.

The other behaviors listed are all typical for a seven-month-old. Smiling and laughing indicate social engagement and cognitive development. Rolling over shows progress in gross motor skills and physical development, while bouncing when held suggests good muscle tone and engagement with caregivers. Therefore, the inability to sit on their own stands out as a potential red flag regarding the child's developmental progress.