Little red spotting found on and off on my 5 months old baby's diapers for 3 days. Any idea if it is due to dehydration? Thanks in advance.

Yes, looks like dehydration. Try to give little one more water these days - but baby 5 months old so not too much too. If u giving fm, can make additional 5-10ml water in each feed. If u latch/bm then maybe spoon feed/bottle feed a bit of water? If u started solids, definitely need to give some water too - I add a dash of water more into the purées whether it was store bought or self made. If after 2-3 days still like that, pls see doctor