Baby is stiffening after crying

Baby is a month old. Legs, arms are stiffening after a hard cry. Naduduling din siya. Tatagal ng mga 5mins. This happened around 3x already. But sometimes kahit matagal iyak niya, it doesn't happen naman. I'm worried but i have seen other mommies kwento na it's the same with them, after a month it doesn't happen na. Sa 1st baby ko walang ganito. #pleasehelp Any thoughts please? #advicepls #advicemommies