Aw, first time mom worries, totally get it! Honestly, poop changes are so normal at 5 months kasi starting solid foods na usually around that time, pero if it's a sudden change from what baby normally does, best to check with your pedia para sure lang, maybe just a tummy adjustment, or could be something else na mas okay kung ma-confirm agad. A few of us mums went through this din at the doc just gave us peace of mind, so don't stress too much but do reach out to your baby's doctor, okay?