hello sir, I have twins one of my twin is not crawling yet is it normal

A. The crawling happens between the age of 9 to 11 months and if it is premature then maybe you can take 9 to 12 or 13 months with premature you can expect a delay of a month or two yeah I don’t know what were the duration of your kids whether they were free term or full term but right now the time is right that kids will start to crawl