I know this sounds gross but get a q-tip with Vaseline and just stick the very tip in her rectum. If that doesn't work which I'm pretty sure it will push her knees to her chest and then do like a jogging motion with her legs

You can try putting 1/2 tsp of caro syrup into his bottle. It works wonders

Maybe try giving him more breast milk than formula for a day, my daughter gets backed up when she has a lot of formula

He's both. @annabellemaesmommy

Is she breastfed or formula fed?

try taking their temperature rectally. my pediatrician told me that. it stimulates it making them want to push whatever out.