Hi! So a few of us tried Bear Brand with our toddlers and honestly it's okay, pero marami ring nabago sa digestion, some kids got constipated pa like your little one now kaya importante talaga mag-check with the pedia first before switching, especially since may weight gain concern kayo. For the ratio, usually it's per sachet's instructions pero mas better na i-ask ninyo directly sa pedia or sa packaging para sigurado. As for stopping milk, most doctors recommend continuing dairy until age 5 or beyond dahil kailangan pa nila ng calcium, pero kung stop na kayo sa formula pwede naman real milk, yogurt, cheese, at calcium-rich foods like sardines at leafy greens, pero i-discuss ninyo rin with your doc kung ano best sa baby ninyo specifically! Hugs, hoping your little one gains better soon!