Naomi gets hiccups as frequently as her big sister did in the womb. Fourth time today, I think. Big brother rarely got them in the womb.
Most of the risks of carrying to term with acrania or anencephaly are the same as the risks of any other pregnancy, except there is a higher chance of polyhydramnios. Luckily for me, Naomi swallows great (as seen via u/s) and I am still measuring a little small for my dates. In severe cases of polyhydramnios, mothers can end up measuring 8+ weeks ahead due to the enlargement from the extra fluid, and/or have to get the excessive amniotic fluid drained off (which is not comfortable or an easy procedure to have).