Formula milk (1- 3)

Help mga mommies! Any formula recommendations for 18 months old? Napakaselan sa formula milk, enfa gentlease from 0-12, nung nag 1 ayaw na nya sa 1-3 enfa gentlease, we tried enfa plain (ayaw lasa), s26 gold (gusto lasa pero ngtatae), similac tummicare (gusto lasa pero loose ng stool, this is his current formula pero sobrang loose ng stool, 1-3x magpoops na walang buo), we are trying NAN optipro ( ayaw dedein, ayaw lasa). Weve tried formula mixing but unsuccessful.