allergy meds😣😥

Ma

Ok so me and my 2 son's (2yo and 6 mo) have had really bad allergies since Thursday and it is horrible stuffy/runny nose itchy eyes sore throat the whole nine yards ok so I i breastfeed my 6mo and I gave him infant cough and mucus zarbees medicine cause it helped my older son and I took benadryl I wanna know if I feed my baby can the medicine mix and be bad for him ?