Yesterday when I nursed my baby, she ended up with hives on the side of the face that touched my body/clothes. I have not changed any detergent nor sprayed or use anything fragrant/perfume. I am so baffled. The hives were so big batch and bad. But they go away after 30mins on their own. What could have triggered?

Thanks! I realised those fragrance sticks diffuser where you dip into the jar of fragrant essence oil maybe the culprit. I just turned the sticks upside down over the weekend... so it could be that? Feeding her solids now. Introduced egg yolks to her on Sat... also a possible cause. I ate sea cucumber on sat.. also possible...? hmmm