I'm worried about my DS. He knows and responds to his name, the word no, and if I ask for a kiss or cuddle.\r\n\r\nThe only word he says is his brothers name. He babbles loads and lets you know what he wants by pointing and crying. \r\n\r\nHe also isn't walking yet. He can stand on his own/ use his walker but has no interest in trying it himself. \r\n\r\nDo I need to be concerned?