Hi C.M. – The first thing you need to do is check that her nappy is fitting correctly as improper fit can contribute to leakage. From personal experience I found Huggies to be the most absorbent on the market and while I did experience the occasional leakage this was usually a good indicator that my children were ready to progress to the next size. I also found that I needed to upgrade before they reached the upper weight limit listed on the pack. You can try and reduce her urine output by limiting the amount of sugar, dairy- or citrus-based drinks she has as these are known to stimulate the kidneys. When it comes to fluid intake, children under 5 years should be drinking approximately one litre per day. If she continues to wet through her nappies I would certainly recommend you consult with your GP, just to rule out any possible medical cause.