Ay alam ko ang worry na yan, mama! At 5 days old, ang poops ng mixed fed babies ay usually loose and yellowish-greenish pa lang, especially pag may transition pa from meconium, kaya normal lang yan most of the time, pero since FTM ka at worried ka talaga, I'd say mag-check na lang with your pedia para ma-ease ang mind mo at makita nila in person kung okay talaga, kasi bawat baby different and they'll know best! A few of us moms din nag-panic sa una with the poops, haha, pero once na-reassure ng pedia okay na kami, mas better ung peace of mind, lalo na first week pa lang.