I, too, used nipple shields in hospital and for the following 4 weeks with my ds because he couldn't latch on. The lactation consultant I saw also said that the newer thin silicone shields aren't as bad as the old thick rubber ones. She also said that, while it would be great to get him to breastfeed without them by 6 weeks, not to freak out about it if we couldn't because she's known of people who used them for 6 months with no problems.
I did manage to get him to suck from me by starting him on the shield to draw my nipple out (for some reason, they'd go soft and flat as soon as his mouth came anywhere near me
) then whipping it off quickly and try to get him to attach then. While it didn't always work everytime, he soon managed to attach that way regularly and then without the shield at all. It usually took up to half a dozen tries to attach without the shield each feed for about a week before he managed to get the idea. Even though it frustrated him (and me) at that time, I found that when he cracked up and started to cry, he'd then really suck hard and attach fine. Uh!
Anyway, he's 7 months old now and there have been a whole bunch of other feeding issues that we've had to resolve since then. Talk about getting one thing down pat then some other problem comes up! But we still seem to manage to get through them, even though it can be really confusing and upsetting at the time.
Also, I've since found out that sometimes chiropractic adjustment can help babies suck better. Apparently the birth process can put the neck and skull out a bit. I only started taking him to the chiro at 5 months, but his feeding has improved since. Just thought I'd mention that if you're open to it.
Anyway, hope this helps a bit, but don't worry if you have to keep using them. Just as long as bub keeps putting on weight etc.
Kath