hi, During teething period ,gums become irritable and kids try to bite on things to relieve their pain and in turn get diarrhoea becoz while biting they might take in dirt .Post diarrheal episode the villi in the intestine gets destroyed and hence temporarily lactose intolerance occurs.During this phase milk is not digested well but Curd and cheese can be consumed since they have very negligible lactose .So I guess restrict milk at present .For Painful nappy use some eazynappi or B4nappi cream and apply it liberally after every stool. Bye Take care