k3d14 this is what i put children of the same age will not reach all of the milestones at the same time ,some children will achieve milestones earlier than accepted rates of development and some will reach them later . thesame child may be ahead of suggested norms in other areas . eg a child may crawl earlierbut begin to talk later. children tend to develop in broadly the same sequence eg babies will roll over beforethey sit up and can say one word beforethey string two words together . hope this helps i have had this marked so i know its ok x