Right on my 2 wd coswoth i have a problem now and then with starting ?

Can go out and about , turn engine on and off and its fine , then sometimes it wont start , sometimes will not even turn over (as if batterys dead)

Whack a set of jump leadfs on it for 2 secs and away she goes

But even when it doesn`t start my batt voltage guage is showing about 12 volts ? and al lights and everything work perfect as in really bright and as normal ? Not long had the car , and had a new battery about 2 months ago

Now even better , this happpened a couple of days ago , and because i couldn`t start it i went on house for a while , came back out and it started ????

The car wasn`t used vey much ?? and not long had it ? But im thinking battery ?? but because its quite new im having doubts ?

Any suggestions really appreciated !