Dehydration or UTI

Hi mommas, i have a 7month okd baby boy, im actually monitoring his pee kase we changed diaper earlier at 7pm I guess. Until now, 3:21 am, hindi padin basa yung diaper niya 😔im trying to research on google what are the possible effect if baby is not peeing much at his age. Its saying na dehydration nga. I also tried to check what are the early signs kung may UTI si baby, isa lang naman yung na observed ko na tugma kay baby, his pee is a bit yellowish and has foul smell. Hindi naman siya iritable or what kapag umiihi, its just saying na keep offerring liquids kay bby. What are the possible cause of dehydration po ba? For me to avoid it as well? #dehydration #sevenmonthold #firstbaby