Where should we get advice concerning the baby’s health since many advisors have become a source of conflict between my wife and me? And I become the bad guy for not giving in to her worries about the baby crying too much.

Ask your wife to take time to study the baby’s character/behaviour.  Each baby has a reason why they cry and the reasons may not be similar to someone else’s baby. It is important to get mechanisms to calm the baby down. For peace in the home, it is important for both of you to agree on getting one professional person who advises you concerning your baby so that you are able to sieve good advice from the bad.