GREENSBORO, N.C. — Newer gadgets called infant formula makers are claiming to make precisely measured, warm, ready-to-drink bottles. But are they worth the money, and more importantly, do they work?

FINDINGS. IF YOU’RE THE PARENT OF AN INFANT, YOU KNOW THEY EAT A LOT AND OFTEN, AND IF YOU’RE FEEDING THEM FORMULA CONSTANTLY MAKING BOTTLES CAN BE CUMBERSOME. ENTER A FORMULA MAKER. SO THE BIGGEST ...