Check out La Leche League Peru's Facebook Page and LLL Peru. Most of the LLL Peru's page is in Spanish, but they do have a monthly English meeting as well.
One tip to remember is that speaking Spanish will help you greatly. You'll be treated differently than if you speak English all the time, it'll help you assimilate to the culture, and you'll be able to communicate easier. If you're looking to learn Spanish, check out Fluenz Spanish, Rosetta Stone, and Synergy Spanish.
The Ultimate Peru List recommends: