Hello everyone, can you tell me how to do it? I gave birth two weeks a…

Hello everyone, can you tell me how to do it? I gave birth two weeks ago. There were problems with attaching in the maternity ward. They advised nipple shields. We bought them, the baby started feeding normally, now he's stopped overeating, he sucks all the milk from both breasts. They said to stop using the shields, but without them the son doesn't take the breast at all. He cries until he's crying and starts turning blue, I can't look at him crying and put on the shields again. Can you advise me on what to do? Maybe someone knows a specialist who could help and teach me how to attach properly?