Crawling is defined as any form of prone progression -- any way of moving in which the tummy is toward the floor. In fact, in one of her many studies on crawling babies, Karen Adolph, PhD, associate professor of psychology at New York University, observed 25 unique combinations of body parts used to propel a baby forward. The most common styles are:
About half of babies begin crawling by keeping their tummy against the floor as they move. Belly creepers usually begin crawling earlier than four-on-the-floor crawlers because they don't get up on their hands and knees, which requires greater strength and balance. Some babies use belly crawling as their only method of crawling until they learn to walk; other babies shift to the classic crawl before they start walking.
Here are some other, less popular crawling methods:
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