My son was the last to walk out of our coffee group - i was concerned but he would use props to help him walk etc. When he was about 18mths old - he just stood up. I didn't think i saw right as he wasn't using anything - but he did it again and from there took a few steps. Fast forward 4-5 months and he RUNS whilst he was the last in the group - he's certainly the fastest! Boys aparently are slower to pickup the art of walking - too many things to get into mischief with!