Not a recommendation for a baby hair clipper

Not a recommendation for a baby hair clipper, as I've never heard one that was silent clippers .but: maybe consider acclimating him to the clippers in small steps over several days or weeks. If he's very sensitive to the noise, start off by letting him hear them from a distance, and move up to letting him watch you use it (further first, then closer), working up to letting him hold it a bit (with the guard on), then touch it to various parts of his body (again with the guard on, making a calm game of it). Let him have control of how close he gets to it, and don't push if he is frightened.