When the Make the Breast Pump Not Suck! hackathon, a collection of roughly a hundred and fifty engineers, designers, midwives, and parents, began on Saturday morning at M.I.T., the atmosphere was part revival meeting, part product launch. Women and men clapped and whooped; babies yowled. (“This hackathon is great. There’s like forty percent women, forty percent men, and twenty percent babies,” one participant tweeted.) Participants were eager to reinvent the breast pump, one of the most loathed trappings of modern motherhood, and their initial ideas ranged from a bra with a hidden compression-pumping system to an app that would monitor milk production and offer customized pumping tips.