Like I said in a previous thread just a couple of days ago. My DS didn't walk until he was 21 months old. He was pulling himself up - but the problem was he was getting heavier and heavier and it's difficult to carry around a 21 month old.

He just got up and walked. It was like an epiphany for him. Hasn't stopped since.

Quite apart from this, his speech was brilliant. He was spending a lot of time sitting on the floor reading books with me. He speeks extremely well. I think he was expending his walking energy on excelling at something else for a while.