Ay, if you're thinking about getting your booster, honestly it's good na you're doing research first kasi a few of us mums got ours and we were better prepared knowing what to expect! Side effects are usually mild like arm soreness, slight fever, or tiredness, nothing too scary, but it's smart to take it easy for a day or two after and maybe have paracetamol ready just in case. Best tip is follow the DOH on Facebook kasi they always have the latest updates and official info doon, so you'll know exactly what's normal and what's not!