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Your Child's Development: 9 Months


Nine-month-olds have a new understanding of the world. They learn that just because they can't see mom or dad at a certain time doesn't mean they don't exist. So now, your baby may begin to miss you when you're gone. This can lead to separation anxiety — distress at your departure.

While this might seem like a bad thing, it's actually very good — and marks an important leap in thinking. Comfort and reassure your baby to help him or her feel loved and secure. 

Doctors use certain milestones to tell if a baby is developing as expected. There's a wide range of what's considered normal, so some babies gain skills earlier or later than others. Babies who were born prematurely reach milestones later. Always talk with your doctor about your baby's progress.

Here are some things your baby might be doing:

Communication and Language Skills

Movement and Physical Development

Social and Emotional Development

Cognitive Skills (Thinking and Learning)

When to Talk to Your Doctor

Every baby develops at his or her own pace, but if you notice anything that concerns you — however small — share it with your doctor. Always tell the doctor if your baby:

Also, if you ever notice that your baby has lost skills he or she once had or shows weakness on one side of the body, tell your doctor.

Date reviewed: June 2016


Note: All information on KidsHealth® is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor.

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