Antibiotics cause diarrhea?

Currently 6th day sa antibiotics si LO kopo due to fever, cough and cold. Hindi sya magana kumain at ngpoop sya 3-4times a day. Ung 3 doon konti lng as in prng poop ng ibon.. I know nkk diarrhea tlga antibiotics, my question is anu po pinapakain nyo ky LO pg gnito maliban sa banana at apple. Ayaw na rin nya kc nito hirap pkainin sapilitan lagi??‍♀️