Bowel Movement issues

Hi everyone! So our baby is now 3.5 months and we're dealing with bowel movement issues that she's been experiencing since she was 3 weeks old. She poops only twice a week--on the third day. Her NP and dietitian have been watching it, recommending prune juice and at our last appt her dietitian wanted to introduce miralax. However, her NP was uncomfortable with that because she is so young so she encouraged me to continue trying to give her prune juice. Unfortunately, she just doesn't like it and won't take it. She had an xray last month and while there was a moderate amount of stool, there was no blockages. Since we got home from Florida last Tuesday, she has been very finicky regarding eating. The last time we were at clinic they thought she might not be eating alot because she doesn't stool often, and I'm in agreement. But she has REALLY been rejecting her feedings the past 48 hours, barely doing 4 oz over longer stretches of time. However, he behavior is the same as usual--she's cheery, active and napping regularly. I thought it was possible she picked up a stomach bug that was going around while we were in Florida, but there's no diarrhea or vomiting and said behavior leads me to believe different. I guess my question is, What's normal here? I googled this topic and some old threads came up, but can anyone give me some input? I'm thinking about calling into the clinic tomorrow. I'm just concerned she's not eating enough (which is true; she's not gaining as much...
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