Here is a nice recipe I found in a parent magazine. This is a special recipe for babies from 10 month on. It's easy and I hope you'll have fun baking them. You can ask your older kids to help you cutting the cookies :-)
D loves them and gets one every morning for breakfast with his milk.
125 g wholemeal flour
1 Ts powdered sugar
1 Ts vanilla sugar
1 pinch of salt
75 g butter
25 g sour cream
Preheat the oven on 180°C / 356°F
Knead all ingredients into a smooth dough and put in the fridge for 1 hour (in a plastic wrap).
Roll dough out to a thickness of 5mm / 0.2inch , cut cookies and place them on a baking tray covered with baking parchment.
Baking time: 12 min per tray
Then frost the cookies. You can color the frosting with food coloring (for having green trees, yellow stars, etc.)