Five months after Todd Bedrick’s daughter was born, he took some time off from his job as an accountant. The company he works for, Ernst & Young, offered paid paternity leave, and he decided to take six weeks — the maximum amount — when his wife, Sarah, went back to teaching. He learned how to lull the fitful baby to sleep on his chest and then to sit very still for an hour to avoid waking her. He developed an elaborate system for freezing and thawing his wife’s pumped breast milk. And each day at lunchtime, he drove his daughter to the elementary school where Sarah teaches so she could nurse. When she came home at the end of the day, he handed over the baby and collapsed on the couch.