Uy, 8 months na talaga at wala pa? I'd really suggest you see your OB about this, kasi even with formula feeding, periods should usually be back by then, might be worth checking if there's something else going on hormones-wise or if may leftover tissue pa from the CS. A few of us moms had delays din, pero one of my friends had to get checked kasi may retained placenta sya and that's why her period took forever to come back, so better safe than sorry! Let me know what your doc says ha, sending you moms support!