Choose a formula milk that has prebiotics, that help in good digestion in babies. Your doctor shall guide you best.

Yes at times formula milk does cause constipation as the babies gut is not strong. In order to make it strong u cud give formula milk that is rich in prebiotics as it helps in immunity building plus improving thr digestion as well. All this helps in making gut stronger. Do try Aptamil as it has prebiotics and is really good for babies.