Around 9 months, many babies show clearer stranger anxiety and can sit without support.
Social/Emotional
- Often shy, clingy, or fearful around strangers.
- Shows several expressions, like happy, sad, angry, surprised.
- Looks when you call their name.
- Notices a caregiver leaving the room.
- Enjoys interactive games like peek-a-boo.
Language/Communication
- Makes repetitive sounds such as “mamamama” and “bababababa.”
- May raise arms to signal wanting to be picked up.
Cognitive (Learning, Thinking, Problem-Solving)
- Looks for objects when dropped out of sight, like a spoon or toy.
- Bangs two things together.
Movement/Physical Development
- Sits without support.
- Moves objects from one hand to the other.
- Uses a raking motion to pick up food.
Caregiving Tip
Stranger anxiety is considered a sign a baby can tell familiar caregivers apart from strangers, and a normal part of development. Giving your baby time to adjust to someone new, rather than picking them up suddenly, can help.
When to Consider Talking with a Pediatrician
If your baby still can’t sit without support, shows no babbling, or doesn’t respond to their name, discuss it with a pediatric provider. This information isn’t a diagnostic tool and doesn’t replace advice from a medical professional.