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Why won't my 18-month-old walk or crawl?
Q: My 18-month-old son has not crawled or walked yet. He didn't sit up by himself until he was 15 months old. He enjoys lying down while playing. When he is standing against furniture, he does not show signs of interest to move. He doesn't sit down by himself; somebody has to lend him a hand. Other than the above, my son is a very, very happy baby, but I am very worried!
A: Helen, it’s good that you’re observing your son’s development closely and that you’re concerned about his progress.

Children’s development covers many domains—the physical or large motor development that you’ve descoted, small motor development (manipulating objects with their hands), emotional development and social relationships, language, and cognitive development (thinking). Children’s development generally follows a pattern from simple to more complex—e.g., first sitting up, then crawling, pulling up on furniture, and walking. From observations of many children, experts have determined the age range at which most children reach these developmental milestones.

For example, typically developing babies usually sit up by 6-9 months, crawl by 9-12 months, and walk by 12-15 months of age. Since your child didn’t sit up until 15 months of age, and is not crawling or walking at 18 months of age, he seems to have a delay in his physical development. That doesn’t necessarily mean that your child is delayed in all areas of development. You descoted your baby as being “very, very happy”—that’s a good sign for his emotional/social development.

Do you take your son to the doctor for regular check-ups and immunizations? Be sure to tell the doctor about your child’s development and have the doctor examine him thoroughly. Ask to have your child evaluated by a developmental specialist to assess all of his areas of development and determine what interventions might be helpful to move his development forward. The sooner you do this, the better—studies have shown that children who get early intervention for developmental delays make the best progress.