First and foremost, we must have a little patience and understanding. Although having crying babies and noisy children at Mass is distracting, it is also important to welcome all to the Table of the Lord — no matter how quiet or noisy a person may be.
If this is a particular problem at your Church, you may investigate the Cry Room. For instance, if there is one at your Church you can make sure it is properly stocked and supplied for all a parent needs. The Cry Room should also be somehow connected to the worship space, so parents who are trying to worship can still celebrate with the gathered community. Finally, if you are willing to go the extra mile, consider volunteering some of your time in the cry room at a Mass, that way a tired and weary parent can get some focused time to pray while you look after the children. Hopefully then, the next time you go to Mass, someone else will be staffing the Cry Room and you can experience a quiet, centered Mass.