The 41-year-old actor needs a raft of assistants to peel the suit on and off, which can take up to 30 minutes several times a day, reported Daily Star.
"The suit is extremely restrictive. Ben finds it hard to perform basic tasks and struggles to look natural. He's also been complaining of problems with breathing, given how tight the suit is," a source said.
"He's also been complaining of problems with breathing."
'Batman Vs Superman: Dawn Of Justice' was due to be released next July but Warner Brothers have now put it back to May 2016 to "allow the filmmakers time to realise fully their vision.