Eleven months the baby will not crawl may be developmental delay, may also not give the baby to create a crawling environment, not the correct guidance baby crawling and other reasons. 1. developmental delay: generally eight months when the baby can learn to crawl, if the baby eleven months will not crawl, and also accompanied by other large motor, fine motor, physical, cognitive, language and other aspects of developmental problems, this situation suggests that there is a child developmental delay. 2. did not create the crawling environment: if parents are too worried about the ground crawling unhygienic, or worried about the baby bumped into the injury, and reduce the baby lack of crawling opportunities, may also lead to the baby ten months will not crawl. 3. did not correctly guide crawling: baby into crawling sensitive period, if parents do not pay attention to guide as well as exercise baby crawling, may lead to the baby will not crawl. If the baby appeared eleven months still can not crawl the situation, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor, improve the relevant examination, clear cause, symptomatic treatment.