Hiccups make it hard to keep suckling on his pacifier.
Ivan hates hiccups for this reason.
I remember how his in utero hiccups felt like strange flutters.

Things Ivan likes:

Singing voices, the dishwasher’s noises, watching lights, his pacifier, being bounced on the yoga ball, riding in carriers that are attached to his parents

Things Ivan dislikes:

Hiccups, gas, having toys shoved in his face by his big sister who likes to share, wet diapers