Girls, who is on IV, please tell me when to sound the alarm if the bab…

Girls, who is on IV, please tell me when to sound the alarm if the baby doesn't poop? It's been two days and I'm starting to worry... The tummy is soft, the baby is relatively calm, not fussing. Before that was constipation, when I gave broccoli, he turned red all day, fussed. I evacuated him and there was a solid stool. I canceled the broccoli, everything normalized, but now silence again...