Ooh buih tu biasanya okay je, especially kalau baby minum formula, air dalam susu tu memang boleh buat najis jadi buih sikit, particularly if baby's tummy is processing the milk quickly. A few of us mum friends noticed the same thing with our babies on formula, tapi as long as baby nampak sihat, playful, dan weight gain bagus, tak perlu worry sangat, tapi kalau dia nampak uncomfortable, ada tummy ache signs, atau buih tu sangat banyak dengan bau tak sedap, better check with your paediatrician just to be safe, okay?