My ds2 is nearly 3 weeks old and has been exclusively formula fed up until now. I still have milk and I would like to try breastfeeding on a night and early morning, but still stick to formula through the day. We've had a bash at breastfeeding this morning but as I've never done it before I'm clueless to whether I'm doing it right 
What we did this morning was just offer breast and he seemed to have no problem latching on. He fed on one boob for about 10 mins and is now latched onto other one. He seems quite happy doing this and I'm presuming he's getting something as he's suckling away? How long should he feed on each boob? Should I alternate boobs each feed or alternate feeds?? What can I do to prevent sore nipples etc??
Any advice and tips gratefully received x