This chord can be slightly hard to play at the beginning due to cramped positioning of your fingers across the three high strings. I suggest placing the 2nd finger on the E string, then the 3rd finger on the B string 3rd fret, followed by the 1st finger on the g string 2nd fret. Try and place the 3rd finger as close to the 3rd fret as you can stretch.
I also advise trying to get the nail on the 3rd finger to point as vertical as you can. By doing this you will be using the thinnest part of the 3rd finger on the string which will help to ensure your not muting the strings either side of your 3rd finger.
With this chord you only play the D, G, B, & High E strings, you should practice strumming down and not striking the low E & A strings.