Is it bad go just let a baby cry if you know he doesnt have colic and isnt hungry or cold? (cries to be held)?

Your baby cannot talk and when he cries, he/she is trying to tell you he needs something. If you were trying to tell somebody something would them ignoring you make you stop trying to tell them? Especially if you were trying to express a need? From my experience, if you meet your baby's needs s/he will stop crying. A baby who KNOWS that his needs will be met and has that trust actually will not cry for no reason. Some people mistakenly believe that by tending to their baby's needs when s/he cries they are "spoiling" him. This is not true. Babies cannot express needs in any other way, and to ignore a crying baby is to ignore him when he needs you. Just because YOU think he is crying for no reason or just to be held, doesn't mean that is why he is crying. Your instinct tells you not to let him cry or you wouldn't have asked. Trust your instinct and meet your baby's needs.