J.C.
Hiccups are usually caused by air caught in the diaphragm (sp). They shouldn't really hurt him, but maybe try laying him somewhere he can stretch out & relax his diaphragm area, so the air can get out. They are definitely frustrating for the little guys. Sometimes a 1/2 ounce or so of a water bottle can help, if they can stop hiccupping long enough to suck with out getting air. My aunt actually would dip my son's pacifier in sugar & let him suck it off & it helped, but I'm sure that's a no-go now days. Make sure his mouth is completely closed on the nipple (yours or the bottle) when feeding. I don't know how to explain it, but also watch for him "sucking in air" while swinging, if you use a swing. It may be none of the above, but things to look for.