Slice the avocado vertically and twist to open. Remove and discard the pit, and scoop out the flesh.
Place the avocado in a small bowl. Mash with a fork until completely smooth for younger babies or leave a little chunky for older babies.
Serve immediately or store until ready to use. Store in an airtight container in the refrigerator for up to 1 day. (The mashed avocado will begin to brown after a day, although you can extend its green color by covering the mashed avocado with plastic wrap and pressing the wrap directly on the flesh, being careful to seal out any air.)
