DS2, 9m has recently started crawling but doesn't so much crawl as scooch around on his bottom, propelling himself off his right foot and leaving his left tucked under him, still in the position it would be if he is sat still. I know there are lots of different techniques babies use to get around but should I be worried about motor delay because two legs are doing different things? He was IUGR (still tiny)and also still doesn't roll from back to front. I have also heard links between unusual crawling and ADHD? Other two DC's used classic crawling technique so this is new for me! Can anyone reassure me or let me know if they think I should get some professional advice?
TIA