They may never: Crawling ends up the least important milestone for a baby. An infant with chromosomal defect usually has low muscle tone and will be delayed in sitting and walking. Most tend to scoot on their bottoms and then learn to pull up to stand and then walk along furniture. They usually do not bother to crawl. Crawling is not necessary. They will progress their way - with appropriate help.
Answered 5/27/2013
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