A spin on the classic 'inner child' work. I do this sometimes when I need a little extra motivation or TLC. This works pretty well for helping me complete self care tasks when I'm depressed.
I find this preferable to "reparenting" yourself because babysitters let you get away with a little more than your parents do and pretending to be your own mom is sometimes too emotionally fraught. It helps that I've always been better at caring for other peoples' children than I have for myself.