Currently Newark Liberty Airport has 1 Nursing Pod for breastfeeding mothers located across from C107 and 1 in Terminal B beyond the security checkpoints.
Thurs May 7 2015 Newark Airport website stated:
Two nursing mothers lactation pods (Seventh Generation-Mamava) are located inside Newark's Terminal B beyond the security checkpoints—one in the B2 concourse near gates 50-57, and another in the B3 concourse near gates 60-68.
The 4-foot-by-8-foot spaces, which are equipped with two benches and an electrical outlet. Their doors fully shut, and the rooms are large enough to fit a family of four plus luggage. There is however no sink due to the small space and lack of plumbing or running water.
One Bad Thing though: One mom rported "UNFORTUNATELY, TSA will NOT let you through unless you have Term B on your boarding pass. I couldn't get in this time and was hoping to pump before my long car ride. I ended up stopping to pump in the car at a rest stop :("