What does her mouth look like when she latches? Kind of a fishy face or like she's whistling? Pop her of and try to relatch her. If her mouth is super wide when she latches and her lips stay flanged out, her latch is probably okay. A little nipple soreness is totally normal but it shouldn't be something that makes you scream out.
Lol. My baby was 6 14oz... I don't think 6lbs is that small, but... if your having trouble with latching, contact your lactation nurse, she'll help you out. Key is to keep trying, give baby a little time. Make sure to bring your nipple up to baby nose, let her smell it. When she opens her mouth, coax it into her mouth. Make sure she isn't sucking your nippleitself but your areola should also be partially in her mouth. You'll get the hang, don't give up. Be patient with yourself & baby. Your doing a great job!
Agreed I had to curl my toes in pain in the initial latch but afyer that it was fine. If it hurts to breastfeed after that than its probanly a bad latch. Make sure that you get most of then areola in baby's mouth or what can actually fit. Also if there is a lactation consultant you could see about them coming to check and see how everything is going.
If she's only a day old you might be sore simply because she had to work harder to get your colostrum than once your milk is in. But that is a good thing because it will help bring your milk in. If it's truly unbearable, pump for one or two feedings to give your nipples a break and feed her the expressed milk with an eyedropper or medicine spoon. Way more messy than a bottle but also won't cause nipple confusion.
I agree with all the ladies don't be afraid to unhook baby and try again and again of need be. Try some lanolin cream and I got some gel packs from babies r us that helped when I got reeeeaallllly sore. U might try a different hold with her too my lactation consultant suggested a football hold since I have big boobs and it helped alot but remember it only gets better