Thanks for posting the query
Actually brief hiccups are usually benign and self limiting. Actually it occurs due to contraction of diaphragm, a partition between chest and abdomen. Laughing also causes contraction of diaphragm, so it can occur during laugh in some person who are oversensitive. Look for any heart burn or regurgitation of feed all these have relation with hiccup.
So I would suggest you to consult a pediatrician
, he will rule out all the possibilities, so that your apprehension will decrease. In most of the cases it usually subsides spontaneously.
I hope this answers your query effectively.
Wishing you and your family good health