J.B.
ok I know this sounds crazy, but I am a chiropractor and my 1st son got the hiccups all the time, so I started adjusting him. Cervical nerves 3,4, and 5 innervate the diaphram. So, when he got the hiccups I adjusted him and gave him water and they stopped with in a couple of minutes. I recommend an adjustment. Good luck!
Dr. J.