Ay, normal lang yan sis, lalo na kundi ka-breastfeeding kaya mas mabilis bumalik ang period mo! Since you had a proper flow in November, that December spotting is probably just breakthrough bleeding or leftover lining, happened to a few of us din after CS, especially if ang cycle mo pa lang nag-regulate ulit. But since it's still within a few months post-CS, best to mention it sa OB mo on your next checkup para sure lang, ok?