can i discipline my 9month old son?how?help me

Disciplining a baby less than a year old is more like creating a positive habit out of your babies activities, rather than making him/her understand that the dos and don'ts. At that age, most babies just can't recognize what are good and bad. If you don't want something done, just be consistent. Here's an article about some tricks in "disciplining" your baby: http://www.parenting.com/article/5-discipline-tricks-for-babies