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to iuyori Only Once desu.
if you want to do it more than once even when mother and baby seems healthy, you’d have to pay to do it.
of course if there’s any difficultyl or concerns, insuarance will cover it.
You might want to tell the doctor that you didn’t do ultra sound at 18 weeks and if its possible to do it now.
the picture of ultra sound is preacious! It is very gross to anybody but somehow, it is very cute to parents.
Good luck!