mixfeed/constipated 5 month old

mixfeed c baby. pero mas mdmi formula, kc sa gabi lng sya nadede skn...worried na talaga ako mommies . nung nan optipro/bm c baby ko.. 4-5 days bgo sya mag poop. so 1 month na nag NAn sya. ngaun s26 gold naman. 4 days na ndi prin nagpo poop. sbi ng pedia as long as hnd daw iritable c bby ok lng daw un. pero mommies pls i need your advice cno b nkkaranas ng ganito.... super stress n kc ako