My ds 9 months can't roll over or crawl and hates being on his tummy. He has apparently no interest in getting mobile- doesn't bottom shuffle/ cruise/ commando crawl etc.
He can stand holding onto something and 'walk' if we hold onto both his hands. He has been sitting since around 6 months.
He is reasonably interactive- smiles and laughs especially at his brother. He claps hands and plays with toys- eg trying to fit balls in the holes of his sorter toy but sometimes seems tuned out especially when tired.
His brother was so much further on when he was this age- not sure whether he is delayed or his brother was ahead or whether there is just a wide range of normal. Any thoughts/ comparisons?