I do the same thing @taytay88 does but with a thermometer, they literally go right away.

Happened with my daughter ...formula fed too. Sounds gross but what I did was put a qtip with a little Vaseline on it and just put it a lil in her bum and it will all come out. Worked great for my daughter she was backed up. Good luck hope she feels better💗

ok ill try because it's making me super nervous,

Do like the bicycle motion with her legs, or take a warm washcloth and move it in circle motion on her belly, or you can do like a rectal temp that should stimulate the bowels. Those are the things my daughters doctor told me to do cause she had the same issue.