Our 15 week old DS loves to stand up with us holding his hands. He's been doing it for a couple of weeks now. When we hold his hands to pull him up into a sitting position, he'll stand instead. I've heard recently that it's bad developmentally if they walk before they crawl and I'm a bit concerned that he might not crawl if we let him keep standing up like this. Does anyone know if babies standing like this stop them from learning to crawl?