Oo, normal yan lalo na kung nagbreastfeed ka pa! A few of us moms experienced the same thing, ang breastfeeding talaga nagpapahinto ng regular cycle for months, kaya hindi ka mag-worry. Since you had your period in December pero wala ulit ngayon, it's possible na bumalik ang hormones mo sa breastfeeding mode, or sometimes the cycle is just irregular pa while your body is adjusting. But just to be sure, best check with your OB especially if may other symptoms ka or if concerned ka talaga, kasi she'll know your full picture better!