Uy, congrats sa baby! Honestly, since mostly breastfeeding ka, it's safer to check with your OB first before December kasi bawat mama's body is different, some get their period right away kahit nagbbreastfeed, iba delayed talaga. A few of us mums mixed feed rin and our doctors had different advice depending on kung gaano kaheavy ang breastfeeding, so better to confirm with yours na lang sa follow-up checkup mo around one month. Pero if you're leaning towards January anyway, you have time to ask your OB about it, walang pressure, and honestly smart move to give your body time to recover din!