You have not given me any indication if your baby's constipation problem started when he was on the antibiotic. keep him on the same formula and give him a probiotic such as Reuteri drops 1ml daily for 10 days. If he remains constipated after this time change his formula. As your baby son has had a UTI make sure that he has a full ultrasound examination of his urinary system to ensure that he has no abnormalities of this system.
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