Dr. Leah Rethy is an internal medicine resident with Penn Medicine. Kimberly Paynter/WHYY hide caption toggle caption Kimberly Paynter/WHYY Dr. Leah Rethy is an internal medicine resident with Penn Medicine. Kimberly Paynter/WHYY Dr. Leah Rethy was pregnant during the first year of her internal medicine residency at the Hospital of the University of Pennsylvania in Philadelphia. She gave birth during her second year. She worked through her 40th week of pregnancy so she could save her time off and spend more time with her newborn. Now she’s back at work and needs child care. A lot of child care. Medical residents often work long and irregular hours, sometimes as many…