I breastfed each of my children for 14 months, so I consider my self a bit of an expert on the subject. Find a comfy chair and try a cradle position with a pillow or boppy for support. Stroke baby's bottom lip with nipple and wait for him to open very wide like a yawn. Push all of your nipple and as much areola as possible into mouth. When correctly latched his nose and chin will both touch your breast and you will be looking at his shoulder which is in line with his ear, hip, and heel. Allow him to suck for 10 min. then switch to the other breast. If you feel you are not producing enough milk the easiest way to boost supply is to pump exactly inbetween each set of daytime feedings for about 10 min. on each side, even if you don't get anything b/c it's the nipple stimulation that helps boost supply. So if you nurse at 1pm and 3 pm, you should pump at 2 pm. Do this for 2 days and your supply will double. Another comforting measure is to weigh baby on a nursery scale without changing his diaper before and after feeding this will tell you exactly how much he is getting. Stop using a bottle ASAP, those little one's are amazingly sharp at figuring out how to get what they need!
