Formula milk is generally heavier than the breastmilk. But these days you get formula milk which has prebiotics and is similar to the breastmilk. Aptamil is very close to mother's milk and has prebiotics. It helps to improve the gut health of the baby

Formula milk does not cause colic issues. Infact it's enriched with ingredients that are closer to mother's milk as well. There could be various other issues for colic in babies. Try giving prebiotics if thr baby has colic issues. It helps in making thr gut stronger

If ingredients of a formula milk has prebiotics , it will not cause colic problem , so better to check ingredients before buying.