Here in Ohio, the actual penalties for failing to report for jury duty vary by county and even by judge (as opposed to the written law). In Wayne County, they would probably just ignore you (perhaps because so many of us take our civic duties seriously that there is no shortage of jurors reporting for duty).
On the other hand, I know of a person in an adjacent county who was charged with contempt of court. He told them that he might have to leave the country during the time he was eligible for duty. Unfortunately for him, he was called for duty when he was out of the country. The fact that he had told them in advance made no difference to the court.
Maybe he was able to have this charge removed from his "permanent record" by serving at a later date. I do not know.
As far as breastfeeding, at one trial the judge dismissed a juror for that reason. At another trial, a different judge did not like to excuse anyone for any reason.
When I was on county grand jury this year, all 9 of us had perfect attendance for the 4 Friday sessions. I guess this was unusual. It made for short days, since nobody had to be brought in as a substitute and brought up to speed.