Ay, good call mo talaga sa pag-switch ng milk! The watery one in your first pic is definitely better than that snake-like constipated stool, pag nahihirapan sila dumumi at namumula pa, alam mo agad na may problema, and it sounds like your LO was really uncomfortable with the regular formula. Since Bonna Low Lactose is making such a huge difference (no more straining, no kabag!), that's your sign na lactose intolerance or sensitivity talaga ang issue, at nakita mo mismo kung gaano ka-happy ang baby now. A few of us moms namin din sa group switched formulas dahil sa constipation and nakita namin agad ang improvement sa diaper output at mood ng babies. Just keep monitoring his stools para consistent lang siya, and if mag-act up pa rin despite the switch, mas okay na i-check with your pedia just to be sure. But honestly, sounds like you already found the solution na!