Mompetition is the one-up rivalry that moms play making their child seem better, smarter, and/or more advanced than yours. It may involve two or more moms and any number of children, even full-grown.
These days the mompetition is much more overt. Moms make snide comments about snacks brought to the play date, outfits worn to the school sing along, or educational choices. They compete to prove their worth. They compete in an effort to prove that they are making the best choices every single day.