if its because of bloating you can try laying him down and moving his legs in a bicycle motion to help release the gas. You can read here for more https://flo.health/being-a-mom/your-baby/baby-care-and-feeding/infant-gas-relief
Always massage her tummy. You can google urutan perut baby. Works wonder for my baby. Every day dia kentut2 & perut dia lembut.
can try massage her abdomen and do exercise and more tummy time