Hi my baby was weighing 7 kg at 3.5 months. now she is 4 months don't have idea about current weight. we are using little S diaper suitable for upto 8 kgs weight. She is having severe rashes near pvt part and thighs from some days. Diaper is very loose don't know why it's happening. Using Parachute coconut oil and himalaya baby powder regularly before using diapers.