mucus and blood in poop

Hnd nman watery poop nya. May konting dugo nga lang at may sipon which is kakagaling ny lng s ubo at sipon. Nung pag chek up nmin pina stool exam if may amoeba. Normal nmn daw at walang amoeba. Nung nagpalit lang ako ng gtas from s26 to enfamil.. Bakit kaya may dugo n konti ? 3 mos old baby. Any experience mga momsh alarming po kasi sa akin.. Baka hnd hiyang c baby