Eh, jangan worry sangat lah, foamy poop kat baby yang fully breastfed tu quite common, especially kalau baby minum terlalu banyak foremilk (the watery milk at the start). Try expressing sikit before latch atau switch sides less frequently so dia dapat more hindmilk (the creamier, fattier part). But kalau baby seems uncomfortable, has tummy pain, or the foam gets worse, better check with your paediatrician just to be safe, they can confirm if it's just foremilk imbalance or something else.