My toddler has been experiencing sickness on and off. I think I need to boost her immune system. Does anyone have any tips and tricks on how to do that naturally? Or at least, with as little use of pills as possible.

My boys used to have the same case. Hope you can check on the ventilation of your place. Sometimes their constant exposure to aircon or sometimes having no aircon can make them sick easily. At least that is based on my experience.