Good old-fashioned condoms for now. NFP is great once baby lets me sleep through the night. But my babies never sleep through the night for me to get accurate temps before my cycles return. Even when I was tandem nursing last time, my fertility returned around 7 months.
Cute story: My dh was at our local grocery shopping for toiletries before our trip to Costa Rica. He said the check-out girl was about 18, very sweet and innocent. He unloads his basket of razors, mouthwash, lotion, and condoms and she looks at him and very innocently asks "Do you have plans tonight?" He said he felt like such a perv.