My 8 month ds is just starting to show signs of wanting to crawl. He's been content lying on his back or rolling onto his side until now. Now he rolls right over onto his tummy, gets his arms forward and kicks back with his legs....but gets nowhere and then starts to cry. I hate seeing him like that, so I scoop him up, sit him down and play for a while, then off we go again. I know he's got to work it out for himself, but is there anything I can do to help?