Should we file an amendment for this?

Our son, who is on SSI, lived with us for 7 months out of 12 in 2019. We received the Earned Income Credit for him, and as such, he was not able to receive a stimulus check. I just checked our return and noticed on the form where it asks how many months he lived with us, we put 12. Should we file an amendment to change this on the form? I always thought that if a dependent lived with you for 7 months or more, you should indicate 12 months. If we are possibly going to be audited, would this make a difference? He is 31-years old.

 

Thanks in advance!