If milk came out of the bottle faster, they reasoned, the feeding would go faster and be easier on the baby. “What we didn’t know at ... MIT Technology Review, and Boston magazine.

For decades, baby bottles have been cylindrical—a design that, while functional, can be confusing for breastfed infants and problematic for parents who need to heat milk quickly and evenly.

A baby’s transition from a bottle to a cup comes with nutritional and developmental benefits, and the sippy cup can act as a bridge from one to the other. “The American Academy of Pediatrics ...