Wa'alaikum assalam! Ahhh the sudden loose stools can be so stressful lah, my heart goes out! A few of us mums noticed our kids had tummy issues when we switched formulas or if the milk was too rich for them, so maybe try checking with the paediatrician first to rule out any infection or allergy, sometimes it's just the formula not sitting well with their tummy anymore at this age. Once the doc confirms it's not anything serious, you could explore gentler options like adding more water to the mix or trying a different brand, but best to get professional advice first since your little one's digestion can be tricky at this stage.