My BFF from high school has a daughter (now 14 months) and works for a school system in NJ; her speciality is curriculum design/evaluation for children on the autism spectrum. Her employer is fantastic - they have a daycare system in the school building (one floor down from the office), and her supervisor and co-workers, all women who have had children, were unbelievably accomodating when she came back at 6 months. A comfy, private place to express milk with good breaktimes (or time to nurse in the daycare centre), and if she was in the office doing work (a lot of time she's out in the community evaluating her caseload), her supervisor would encourage her to bring her daughter upstairs.

My friend was so touched by that, and, not unsurprisingly, has extremely high morale, loyalty and a desire to stay with the school system at least until she's done having a young family. We're talking at least five years, minimum.