my lo has not yet poop for 24hrs what should i do? should i bring her to her pedia immediately? my lo is EBF

our pedia advice us to let my twins drink prune juice 1-2 ounces (once a day) to have a healthy bowel movement. they started drinking it when I noticed baby girl didn't poop for 2 days and baby boy is constipated. they were only 7 months that time