Look for a kiwi that feels soft when you gently squeeze it. If it's rock hard, it's not ripe and will very likely be too tart and hard to chew. If it's too soft, it may fall apart. Golden kiwi is usually a little less tart, so that's a great option if you see it!
Place the kiwi on a cutting board. Slice the ends off.
Stand the kiwi up on one flat end. Slice down to remove the remaining peel.
Lay the kiwi flat and cut slices.
Serve or cut in half (18+ months and up) or dice it (9+ months) depending on the age and chewing ability of the child.
Notes
Cut kiwi is best served immediately. It softens a lot if cut up and stored in the fridge. (Younger kids may not mind that, but older kids probably will notice.)
To serve kiwi for BLW, leave the skin on so it's less slippery and slice into long quarters.
To serve kiwi as a finger food for babies 9+ months, dice into small pieces.
To serve kiwi with a spoon for kids over 2.5 or 3, cut in half and show the kids how to scoop out the fruit.