Place eggs in a single layer in medium saucepan. Cover with cold water by 1 inch and add baking soda. Over medium heat, slowly bring to a boil. When you have reached a boil, cover and remove from heat. Let sit for 8-10 minutes.
Meanwhile, fill a medium bowl halfway with ice and cold water.
With a slotted spoon, transfer eggs to the bowl of ice water, this will stop them from cooking. Let cool for at least 10 minutes and then transfer the eggs to a towel to dry. Peel and scoop out egg yolk.
When ready to serve, peel the egg sheel and scoop out egg yolk.
You can serve the egg yolk to your baby whole or chopped in small pieces for a finger food or smash with a fork for a baby food puree.