Ay, I'd definitely bring this up sa pediatrician mo, mama, pink staining or powder in baby's urine isn't something we usually see at 5 months, kaya better safe than sorry! A few of my mum friends have had similar concerns and their docs reassured them it was usually nothing serious, but some babies can have uric acid crystals (urates) na nagpapink ng diaper, especially if they're not drinking enough milk. Best to get it checked out quickly lang so you can have peace of mind and know if baby needs adjustments sa feeding or if it's something else entirely!