Powder vs Premixed formula

Alyssa • Boy Mom ☺️💙🐶 Dog Mom

Formula question here! My LO has been on similac premade formula since the hospital. He’s now almost 7 weeks so I figured I’d try to switch to the powder version to save $. He’s been super fussy all day and only goes about 2.5 hours between feedings. On the premade he goes about 4 and seems a lot happier. Obviously I’m going to go with what makes him happy and feel better but I’m curious if anyone else seems to have a similar issue??