My one month old wouldn't stop crying all night all of a sudden.

So all of a sudden, bigla na lang nagkaron ng discomfort ang baby namin one night. Medyo mababaw ang tulog niya during the day, then kinagabihan, still, medyo umiiyak siya kapag dumedede. Until, around 2am, iyak na siya nang iyak and medyo lumalakas na. Now, we suspect baka dahil hindi pa siya nakakadumi for almost 2 days. Although upon Pedia's advice, it's normal for a new born not to poop (pure breastfeeding) for even up to 7 days. Pero, nung 2am naman, during umiiyak siya, nagpoop siya and medyo marami than usual. After that iyak pa rin siya nang iyak until morning. Pag dumedede, umiiyak pa rin. Is this normal for a month old? I read about colic crying as well which is I guess normal for a month old baby until 3 months. But that's only according to my shallow research. (Google google lang). Should we worry? When should we bring her to the hospital. Wala rin namang lagnat si baby. As in parang discomfort lang talaga. Pero since we don't know what's causing her pain/discomfort, we don't know what to do. PS. Currently, she's asleep while naka-latch sa mom niya. She might cry hard again when she wakes up. Worried lang.