Don't worry  every child is different.  Some learn fast some need time.  Just keep talking to your baby. 

Just keep talking to your child give him language. he will pick up even now. when he starts talking you will be amazed

Teeth will also erupt no worries

Each child is unique and different. No two kids will attain milestones in the same way.<br> give it time.<br> some kids learn early some late.

Please give it time. Baby is still very small. <font color ="#3b5998"><b><a href="http://app.babychakra.com/article/1053">Baby&#8217;s Development Milestones: 11 - 12 Months</a></b></font> is a good read.