It doesn’t really come up all that often, but when it does it has never been a problem. We occasionally attend daily Mass at a nearby parish, but it is often my own pastor who says the Mass. On other occasions, we have approached the priest well ahead of time to let him know the situation. Five different priests have given my young children Communion. One of them had to check first in order to make sure it was okay, but came back within five minutes to let us know that it was fine. On other occasions, when we haven’t had a chance to talk to the priest, we just tell our children that they can’t receive that day. The Communion line isn’t the time to explain to someone why your 2-year-old is approaching to receive.