He can't pull himself to standing, he can't actually stand up even when placed there and holding on to something. He can't cruise, because he can't stand up. He obviously can't walk either. He doesn't have any words, he does babble. He can crawl but that's about it - honestly he seems more like an 8 month old than a 16 month old! When do I need to start worrying? I mean I already have tbh...