Puree raspberries with 1 Tbsp lemon juice and 1 Tbsp sugar in a blender. Pour into a popsicle mold and freeze until firm.
Stir milk into into Greek yogurt until smooth. Pour into popsicle mold on top of raspberry layer and freeze until firm.
Puree blueberries with 1 Tbsp lemon juice and 1 Tbsp sugar. Pour into popsicle mold on top of yogurt layer and freeze until solid. Remove pops by running under warm water until you are able to pull them out.
Notes
Taste berries before pureeing. If they are very sweet, add less sugar. If they are sour, add a little more.