Ay sis, totoo yan, sobrang common sa mixed feeding, lalo na kung hindi madalas baby mo sa dede! Seven months na din, kaya it's possible na may plugged duct or cyst na nag-settle doon, so I'd really suggest checking with your OB or breast specialist para ma-rule out kung ano exactly yan at ma-confirm na safe lang. A few of us tried warm compress and gentle massage while baby's nursing (if baby's willing pa humabol sa dede), pero honestly kailangan ng proper check-up lang talaga para mag-peace of mind ka, better safe than sorry, no?