Aww sabar ya ibu, constipation tu memang bikin baby stress dan mummy lagi stressed kan! Few of my mum friends pun pernah deal dengan ni, some tried switching brands, some adjusted the ratio sikit, tapi since ada darah tu I'd really suggest check dengan doctor dulu to make sure baby's digestive system okay, sebab constipation dengan berdarah boleh jadi sign of something that needs looking at. Meanwhile, memang susah nak cari buyer untuk formula if baby x cocok, tapi good on you for trying different options, hopefully the next one will be gentler on his tummy! Sending you patience lah, this phase will pass.