My baby is becoming a anti social..she just doesnt mingle in a crowd n sticks to me..is this normal behaviour??

When baby is young, it is very normal for them not to mix or mingle with friends or strangers as they feel very insecure with unfamiliar environment/people. After they attend school or playgroup, they will outgrow it and more socialable. What you can do now is to let him join playdates with friends or neighbors' kids. Also, there are some weekly classes such as kindermusik, MyGym playgroup that you can join together with your baby. This will be a good start to encourage baby to be more socialable.